Very good concept - more than one way to beat the level. I don't feel like it's necessary to block upgrades for the whole game.

I know that's the topic of the jam, but what if you can change upgrade every checkpoint (if you reach let's say second red checkpoint you can move to the second yellow or blue checkpoint)?
Some more effects for jump and death would be cool

I'd like more checkpoints in the game 'cuz I'm lame!
Wall jumps are my fovoure and you made pretty clever yellow levels!