I like the idea here, not my type of game unfortunately but I did think the game would be fun for those who do.
As other have stated, stars can sometimes double spawn.
Only other criticisms I really have are
A) I think the disintegrating platforms should probably be a little more consistent. There were a couple of times where if I walked across a bridge of them, every other one would disintegrate.
B) Enemies maybe shouldn't be knocked back, at least as much. Made it kind of frustrating to grab the stars from enemies you placed on smaller platforms.