Agreeing with other comments that the instructions aren't clear; I had to look though the comments to figure out what was going on. Some other issues that I noticed:
• in addition to the controls page not being clear, it's not clear from the game over screen that it's a game over screen.
• Space bar jumps, but it also scrolls down the itch.io page, so every time I jump I have to scroll back up, unless I play in fullscreen. I don't know if this is something that the engine/framework you're using lets you fix or not.
• Is there a pause button?
• Everything depends on color, which even as someone who's not colorblind, means I keep having to try to remember "wait, which one was green again?" (although maybe I've started to figure it out a bit)