No issues
It just works.
Even the previously broken intro video is working now.
Runs OOTB. Fun little bullet hell game.
The short intro video showing the Fantastico Studio logo is replaced with color bars.
Now playable with default Proton
The short intro video showing the Fantastico Studio logo is replaced with color bars.
Whereas the game would get stuck at a black screen with Proton 5.0-10 and Proton 5.13-6, it is playable with Proton 6.3-7, with only one minor issue: the intro video with the developer's logo won't play, and displays as color bars instead. (Proton GE fixes this, but I suspect that this issue is inconsequential to most players who may prefer just to use the version of Proton provided by Steam anyway.) From the opening cutscene proper and onward, everything displays and functions normally with Proton 6.3-7. Controllers and local multiplayer work as expected.
5.9-GE-5-ST GloriousEggroll
https://github.com/GloriousEggroll/proton-ge-custom/releases/tag/5.9-GE-5-ST
With Proton 5.0-9 (and all previous versions I had tried), the game does not work at all; I just get a black screen, and a force quit is required to close it. However, with Proton 5.9-GE-5-ST, the game works perfectly.
Black screen.
When I try to launch the game, the Steam overlay works but the game itself does not. I just get a black screen, and a force quit is required to close it.