Thank you so much for your review!
Because of limited time, Almost all the graphics and sounds were generated via code; I'll be looking into modification in the future.
Regarding the keybinding issue you mentioned, you can rebind your keys in the pause menu (top-left corner).
The explanation for the phasing mechanic has been updated to 'Toggle Red/Blue block passability.'
Again, thanks for the feedback and for checking out the game!