Counter is black so 4 colors total that i noticed. Liked the graphics and the look of it. Controls were very floaty and jump being up was kinda janky.
I liked the colors (I think the black box at the beginning probably puts you at 4 though). Short and simple. No audio though, which would have improved it quite a bit.
Enjoyed game. A bit hard (not much time to react when your window to press is so small before you are hit). Also on one play through it seems like a group of button presses i missed one and the other input disappeared (causing me to be hit 2x as i couldn't press a key to avoid the second one as the arrow above it was gone). Some music would have been good too.