Great game! Had a lot of fun playing this one. Controlled well and had some creative ideas. Particularly loved the trampoline mechanic. That thing was darn fun to use.
Boss designs were kind of just okay. The coolest one was the heart as its shockwave move encouraged use of the trampoline, though in the end it spawned too many enemies for me to handle so I just chipped at it whilst circling from outside of its attack distance.
The rewind mechanic after finishing a loop was pretty cool, and the BGM made everything feel pretty epic.
Good work!