I wish the difficulty in the main levels starts just a bit higher than the guide levels feel cuz this game has tons of potential, but it's just a bit too hard to get into the main levels, since they feel like that crushingly-difficult old school kinda feel, which works for some but I think most people would rather the game slowly build up to that level of difficulty. One thing I'd like to see is the level design given some room to breathe; most levels feel really tight and claustrophobic atm.
Having to press spacebar/ W or S to make yourself heavier versus the traditional jump is such a small change but it gives this game such a massive difference in feel compared to other games. Balance out the difficulty curve, you've got something here!
Oh also, the music didn't really seem to fit well, the game has this 2000's Flash/PC Game aesthetic and I think something like House or Trance would pair with the visuals much better!