I really like this but you have to change your key set up because Q, E, F is a lot farther for the fingers to press than Z, X, C when you spam them.
Playing this game in full screen seems to end the game prematurely before you can go beyond 8 even if you still have health.
After you limit break, the flash is not intentionally challenging and hinders your ability to survive and keep playing.
A pause menu would also be good because I want to rest and keep my progress instead of slogging through more waves of enemies from the restart.