Great game. Feel like the collapsing physics for bosses in particular could've been more realistic, but maybe they follow suit with the rest, where you have a little time to escape falling debris... variation and challenge feels just right, and a massive extra if you really want to go for all those stars.
Props especially on thorough configuration! Works great even with more low-end hardware when there's not only the quality switch but also disabling of effects. Most don't seem to put as much thought into that bit.