This one is such a sleeper hit. I'm so impressed with how much you managed to cram into this little thing, with its 5 difficulties, 4 weapon types, 7 colors, variety of enemy types, tutorial, and other mechanics like the timer! So much to love about this one. I thought the way that the PowerShell was introduced was clever, in how it forced the player to learn how to operate it first. And I thought the decision to include a timer was a smart way to force the player to not stand in a corner to heal.
I did wish the other colors had more of a use in the actual game beyond the tutorial, though.