Whoops I forgot to mention these (correct as of Proton Experimental ver. 12th January 2023):
- Sound effects cannot play again until they have finished playing (that's why I edited the vine boom to cut abruptly).
- F4 fullscreen view mode is correctly blurred in Desktop mode, but not in Gaming mode.
- This bug might be intentional in SteamOS Gaming mode. Otherwise, certain GameMaker games with pixel art and/or tiny resolutions (e.g. Undertale, Princess Remedy in a World of Hurt) would end up horribly blurred by the built-in fullscreen mode.
- Even then, you could change the scaling to Integer/Pixel in the (...) Button -> Power settings menu or just rescale the game window in OBS Studio.
- F8 scaling mode in Ninja Numpties 1.1.0 was added to take advantage of the F4 fullscreen mode not blurring in Gaming mode, so you could have massive, crystal-sharp pixel art with perfectly square pixels!