Thank you! Actually, I'll tell you exactly how to (mostly) 100% the game. What you need to do is collect every cookie crumb, destroy all possible magic dust (excluding the level four minigame), and collect every small magi dust. That should get you pretty much all of the way there!
I'm honestly surprised how long this game is myself, seeing how long I had. The amount of testing was truly ridiculous, thankfully my friend (who made the music) helped out with that. We both were going crazy by the end, though, but the payoff was worth it(maybe)!