I faced the stuck boss bug a couple of times but fortunately it was always close to the beginning so it really was never irritating and I eventually managed to beat it fairly.
The game looks, sounds and feels really good and is pretty fun to play, those two patterns are both super cool and the difficulty is on point (the loop could probably be slightly harder while the boss would have a bit less health in return but it's fine), it's satisfying to beat the game.
Very cool entry, thanks for sharing.