Cool! I shattered 59 times. As others said, the music selection really makes the whole experience. The controls were fairly good once I got used to them, fit with the lightness of the music.
As I found the game fun enough to stick with I accumulated some criticisms:
- The collision detection for jumping has some odd hitches. I found myself doing extra jumps midair (before the double jump) sometimes, usually when near platforms or a wall. At first I thought this was an intentional wall jump mechanic I didn't understand.
- It was hard to tell how many hits I could take before dying, didn't seem consistent. This made it harder to take advantage of the forgiveness of multiple hits; if I got hit early in a room I'd just die and restart rather than risk dying after getting through most of the room as I might have only one hit left. An indicator would help.
- The jump sound effect seems too long, and the grunt damage sound is weird for a featureless square (it was almost funny, but mostly grating).
- I think the Automaton of Fun couldn't actually hit me unless I ran into it, it'd just stand there swinging its sword without connecting. And maybe half the time I'd dash through it without it taking damage.
- Because the square is featureless I can't see which way it is facing, so I'd sometimes dash in the wrong direction.
- Dark grey platforms are hard to see on a black background. Same with the dark blue used often in enemy bodies, particularly with the spikes on the end of the wide flat enemies which were practically invisible.
- The knockback on ceiling and wall spikes would tend to drive the player back into the spikes, along the wall, though sometimes the subsequent hits didn't seem to do additional damage.
- I kept expecting to have to do more backtracking, fortunately I could check the map and see there weren't any doors I'd missed so I didn't have to redo much needlessly.
Note that I played the browser version, on a keyboard, so some of this may be due to timing bugs exposed in the browser. Sorry that the list is so long, it's easier to spot specific issues than things that worked well, and overall it worked quite well!