Hi! Thanks for reporting your thoughts on BeatCubes :)
The issue “Renderer process crashed: oom (-536870904)” may in the worst case be something that I unfortunately cannot fix, as this may be an error with the current Electron Version.
According to the game, the songs are already sorted by difficulty level (going from easy to hardest, top to bottom), but i'll look into it.
You can change your keybinds by pressing "Change Keybinds" at the bottom in the main menu.
After playing the first level, the text "A S D F" is removed at the bottom. This is intentional and is added to add further difficulty.
Once again, I'll look further into these issues and report back. Thanks!
For further updates on the game and development process, please go to the new owners itch.io page, Zephrya Games.