

6~7w: 90 fps

Unsure why it's now showing Unsupported as the game plays smoother than ever and crashing has been all but banished.
Some UI elements are quite small.
Should really show as playable on steam. Great at 90hz

Had no issues installing and playing it, audio was working fine. Plugged an external keyboard and it was able to detect it and had no issues changing the binds ingame.

Consistent crashing makes the game unplayable. This persists across various versions of Proton
Seemingly completely at random
all

You have to restart the Steam Deck before playing the game or else you have return to desktop every 30 seconds. After restart, the game plays fine.

As of SteamOS 3.5, the game is prone to constant crashing and shows no signs of getting any better any time soon either on the developer's front or Valve's.
When it isn't crashing, the game plays spectacularly well but unfortunately, I cannot maintain extended play sessions without it crashing to desktop each time.
I have performed all troubleshooting procedures such as using different versions of Proton, using Proton Experimental, clearing shader cache, clearing Proton files, etc, etc, but have found no headway to making the crashes go away, outside of potentially downgrading to SteamOS 3.4, where the game ran perfectly fine before.

Latest patch massively improves performance on deck. Can run uncapped at ~340fps, though I recommend capping at 144. For minimal latency, allow tearing in Deck game config settings and change the audio device to Virtual Sink.

steamos 3.5.7 all proton
30~55fps
steamos 3.5.7 can't play

Cannot reach 60FPS and constant random judders
Has a tendency to randomly crash, but also not always? Sometimes stable with no issues, no rhyme or reason to when this happens
Consistent stable performance is a requirement for rhythm games and at the moment, there's a massive issue with the game's framerate that will never reach 60FPS the moment you're at the menus and in-game. There's supposedly a WINE patch that fixes this that you can find on the Proton GitHub issue tracker, but requries making your own custom build of Proton specifically for this game to fix.
There's also a random chance of the game just crashing within a minute of the game being open on the new stable SteamOS 3.5, but this is also incredibly inconsistent. Earlier I was having the crashing issue, but upon trying to post a report comment to the issue tracker and getting logs for the game I didn't run into a single crash. Your mileage may vary.
Swapped start and select because the game uses the wrong icons
Most text is readable, but some of it is too small
the anticheat doesn't like when the deck is put in sleep mode and closes the game

Used Decky Loaders "Storage Cleaner" plugin to erase the games Shader Cache after each update since the updates lowers peformance otherwise.
Turn off the FPS Limiter and turn on Allow Tearing in the QAM menu to improve input latency. This is an SteamOS issue and I recommend doing this in any game which may require accurate and fast inputs.
While playing ranked I have once been kicked out from the game by the Anti-Cheat Xingcode so that could happen if you are unlucky. Otherwise no issues.
No issues here. The game is Always Online so you need an internet connection to play.
Works great docked and 60-80 FPS should be doable unless you play in 4K. I play with background videos on but disabling them may increase performance.
If you are having issue with the game force closing after playing a couple songs due to the anti-cheat not working properly, switching to Proton Experimental helped me resolve it. Otherwise the game works out of the box.

If you're having performance issues after the latest update (or any future updates for that matter), clear your shader cache. Install decky-loader and within it, install the storage cleaner plugin. It'll let you clear the cache for specific games. Clearing cache fixed the game running at 45-50fps.

Seems hit-or-miss for people, but I've had no trouble with the game. Make sure to change your playback device in the settings to ACP/ACP3X/ACP6x to get ASIO-equivalent audio latency on Linux. I'd also recommend changing the VSync setting to 144fps limit instead (any limit should work really), and in conjunction, setting the Steam overlay FPS limit to 60 and allowing tearing. These settings eliminated the visual delay of VSync without causing any visible screen-tearing issues (despite the odd choice to allow tearing). Finally, don't touch the TDP limiter for this game. It will absolutely obliterate performance no matter what you set it to -- I assume it's just not playing nice with Xigncode or something. Game draws about 9W combined of CPU and GPU overall I'd say.
I finally got a deck and tried this despite it still being borked on my desktop. And surprisingly, it actually worked with no issues out of the box? Proton 7.0-6 is recommended and that's what I use. I couldn't tell you if they changed something deck-specific or in a super recent update, or if the problems are just really inconsistent per user in general
It can still be enjoyed, but only if you are patient due to fruequent force closings from the anti-cheat.
Only had out of sync audio for one song, haven't experienced it since relaunching the game
It force closes after every 2 songs in freeplay "due to abnormal behavior". Seems like there may be an issue with the anti-cheat currently.
Other than the frequent force closing, the game runs great with default settings.

-force-d3d12
Small text
Well from time to time there is stuttering but somehow "-force-d3d12" run comand makes its less noticeable

Some of the secondary text in the UI gets very hard to read, as it was annoyingly small even on standard displays.
Suspend mode is 100% broken. If you use it, the audio timing between the background and keyed notes gets completely thrown off and the anti-cheat software will kick in and force close the game.
- Game uses XIGNCODE anti-cheat and has an always-online requirement. The anti-cheat does play nice with Proton with the current version of the game and the current stable version of Proton, but the game will not work at all without an Internet connection of some kind.
- Disable the frame limiter within Gamescope to reduce input latency, which is critical in this game. The game always seems to cap its update rate at the display rate, so it won't hurt battery performance.
- Battery performance is very good -- about 4 hours on a full battery.
- The highest difficulty level (SC) was designed for keyboards and is not fully playable on the Steam Deck, at least with the default configuration. All other difficulties and modes work fine. You may be able to address this by double-binding inputs on the back buttons to hit button combinations normally impossible on a controller (like 1+2+3 on 6B/8B mode), but you'll need to cofngiure that within Steam Input as the game only takes XInput devices.
- As of the current stable Proton release (7.0-2, at the time of this report), videos work without issue. You don't need to use Experimental or GE for video playback anymore.
-support for steam deck was added with v1127 -this game is always online with xigncode3 (anti cheat) -There is no need to adjust graphics settings to achieve 60fps
Text is pretty small and not very well readable
Game might crash if Steam Deck is put to sleep mode
The Video Animations are missing but its fully playable without installing Proton-GE as of March 31st 2022
Text in the game is generally quite small and some can be hard to read on the Steam Deck display.
Occasional crashing after suspending gameplay through sleep mode, the game throws an error when waking.
GE-Proton7-9 is required for BGA videos to function properly - I tried both Proton Experimental and GE-Proton7-10 and with both the BGA videos did not appear, although outside of this the game played as normal.