Thanks for playing and constructive criticism!
If you reached the wall jump section you got very close to the climax. If you are interested you are welcome to watch the video attached in the submission page or try to continue from where you reached. (Although there is quite a lot of wall jumping coming so be warned XD)
1-2) The laggy feeling is caused by the low frequency update of the color splash, will keep that in mind!
3) I agree, there is much to improve in the movement
4) The wall jumps are a 1 miss fail, missing 1 wall jump means no more wall jumps. I should have made that more clear or let the wall jumps reset with a timer.