Hi!
The idea is really cool, throwing balls that jump and bounce so you can have a nice combo of finding all invisible platforms in 1 go, i think adding a "score" for how many balls you throw can be a really cool idea! (the less balls you throw is a huge multiplier for how many jumps or movement your player made to reach the end).
Regarding the actually movement of the player - it could use some major improvement.
For starters - give the ability to move without the need to jump, for some reason you can only move while jumping
The movement while jumping isn't capped, it can go really really fast.
The simplest 2D controller + coyote jump would do wonders here.
GL, and GJ for finishing a game with these mechanics in 1 month! keep up the good work :)