I would have switched the colours, so being red shirt means red are solid (maybe an accessibility option to decide). I kept on messing up because the colours felt backwards to me.
This 3 block high jump feels almost impossible, you basically have to glitch through the platform. And then there is another one on the left just before the flag!
It felt more like I was trying to fight the collision physics than actually trying to learn a game mechanic.
The music loop was too short so I had to mute it immediately.
I hope you don't find this comment too harsh, I still had fun even if it was a little frustrating. You should be proud you managed to make a functioning game in such a short amount of time. Good luck in your future projects!