Uoaaaal, it was such a pleasure to read your comment! So many great ideas, sweet words and helpful feedback. Thank you so much!
You're totally right about having an arhythmic track in the background. The inspired tracks from Xchronomorph (a software for messing around with polyrhythms and balanced polygons) actually include that kind of background effect in their demos, but I didn't think of implementing it. It was my first time playing around with music, and discovering this mathematical side of it filled me with excitement and joy.
And about making the game more forgiving, I couldn’t agree with you more!