I'm aware of the sloppyness of the engine, so in case you didn't know:
I've started development on Gamemaker 2, and will release a new version soon. I will probably keep updating GD Cosmic Slice if I can, but it's just a matter of time that it dies and gets replaced with the new one. It's harder to work with but offers more freedom. Also, most of the music is random unused Pizza Tower OSTs (used as placeholders) since we lack of musicians- that's why it's pretty mid.