

Mod Manager dev is intentionally preventing Steam Deck support so there's no real point to buy the game for Steam Deck.

Behaves exactly like it doies on Windows with one downside for people who want a better Super Monkey Ball experience.
Runs with no sweat playing the game at max settings at 800p. The only downside is that the Banana Mod Laumcher doesn't really work so no accurate controls or any other QOL mods or mods to make it more like the original like Dynamic Rolling Sounds, Timer Countdown Sound, Collision Fixes, Disabling Helper Prompt, Graphical Tweaks, and UI Enhancements.
You can replace textures and sound files to again make it a little more accurate to the originals and more presentable in terms of being a remake. Dole Bananas, Original Monkey Voices, Original Announcer, and restoring your regions DreamCast logo for the Sega Console DLC.
Runs fine vanilla, but the game doesn't see the mod loader on Deck which is a huge bummer.

Set the left thumbstick to use a square deadzone.
Plays great without any tinkering.
Added low sensitivity gyro controls, awesome experience.