Great idea, great game, shitty graphics.
I recognised that procedural music in the first 2 seconds! ahahha I used to use that procedural music thinking it was saving me time in ludum dare, but actually you still need a couple hours to make it sound decent, and you probably have spent some more hours learning about that software that makes the music for you. I really think all this time would be better spent trying to improve your real skills in making simple music with FLstudio or some other program. I think a simple track with a couple chiptune chords and some base is much better than the random notes of the procedural music. Not only that, but if you start making your music you will progress, and you will get a skill for the rest of your life.
ALso, the tutorial had too many words (you wanna keep tutorials with least words as posible, ideally none). Things that will be instantly seen by the player (like "this powerup even bounces once!", the player will see that), you don't need to say those in the tutorial. I understand you didnt have time to make a super-dope tutorial, but anyway it was so fucking colorful I almost died when I opened it! xD Also the size of the different instructions was different: some lines were bigger than others without any reason. It made it look unprofessional.
I really think you could further develop this game and even sell it if you added some better sprites, gamefeel, polished gameplay and a decent tutorial xD