Green part puzzles were much better, I found earlier parts too slow and mundane. There was some precision jumps but the main challenge comes from the control map. I was constantly trying to jump with space, pressing R instead of E. Pressing Q where I don't wanted to press. I don't understand why you did not use arrow keys for movement for example it would be much better.
For example one time big guy was on top of small guy and instead of just space I also press Q big guy spawn on the top of small guy which normally where he was already but there was a little spike to the right and he spawned a little to the right and I admit I kinda get a little bit angry but don't worry I won't kidnap your wife.