I appreciate your input! I've done work to make the controls and player feel much more responsive and have more weight. I've gotten many comments of the floaty nature of the player and have hopefully resolved this.
As for the matter of controlling your player in the air, I have decided to fix this by adding multiple difficulties. In the base difficulty, casual or assisted mode, you will be able to control the player while in the air and have access to checkpoints. And in higher difficulties, you will not. Among other changes. I believe this is a good compromise to have a mode for players to learn the layout of the game and the mechanics of the player, while still being able to have the challenge I'm looking for. I'm also modifying the movement mechanics and how they function to make it more intuitive and fun.
I'm releasing a new overhaul update come next the end of next week with a full level redesign, more background art, better mechanics as I mentioned, and a proper ending. I'm grateful you saw potential in my game and hope you give it another chance at some point when it's further in development. I have quite big plans for this game and would love all the feedback I can get ^^.