Lots of fun. The art, level design, sound effects and music were great. Major VVVVVV vibes! I even went back to get the "good ending." :)
hopefully constructive feedback:
There were a couple times where I hit a spike where it didn't quite look like the character model was going to be hit (i.e. on the leg by the flying spike, or barely hitting the corner). An idea to alleviate that might be making the hitboxes a bit more forgiving on the corners and such.
The "feel" of the controls could also be a bit tighter, if that makes sense. Sometimes I felt like I was a bit "floaty" for a platformer, but that's also a style choice and just my personal preference.
Overall, great job! Love that controller support + volume slider, too!