Had to manually intervene and set the "web browser" control template after starting the game. Deck Compatibility notes claim 'all functionality is accessible when using the default controller configuration,' but as far as I can tell there is no default controller configuration set by either Valve or the developer; when I started the game, my deck just loaded the alphabetically first community controller layout for a steam controller (not even a steam deck!), which had wonky unintuitive controls and wasn't sufficient for me to play the game.

default is quite small. Setting zoom level to 130% (the maximum) improves readability; it's still small but manageable for me

Attempting to toggle fullscreen on in the game settings always causes the image to freeze, necessitating killing the game from the Steam menu

Clicking and dragging an item to another tab in the bank reliably breaks the game in one of three ways: I am left looking at either a black screen, a black screen with a white box on it, or a frozen image of the screen right when I dropped the item in the new tab. In any of these cases I cannot get the game to respond or recover input without killing it and restarting it. Besides this, sometimes when playing, I become spontaneously unable to interact with the game window, either by using the touchscreen or with the trackpad mouse I have configured; in these cases I can still see the game window updating so I know it's still running, but it's as though it has lost context, and I can't interact with it. Have not found a way to restore control without killing and reopening the game from the Steam menu.

Sometimes the game starts up near-immediately, but other times (seemingly arbitrarily) it takes prohibitively long to start (30-45 seconds), and sometimes it seems to get stuck and doesn't start at all (even after waiting several minutes or longer)