this game is pretty good but i feel like there some problems with it
1 it could have been released a little later to change some things like the exit level animation is a black square the door at the end is stretched and the some sprites are scaled weirdly
2 the level design isn't bad but there are way too many leaps of faith and sections that are larger purely because of the double jump instead of doing things that the double jump needs to exist for
3 (kinda unnecessary but it would be decent i think) slowing down momentum upon double jumping would give the double jump a drawback to it since in this game there isnt a reason not to unless there is an enemy above you