The platforming feels so much better than my game, great job! Music is also killer, it's like you got Kavinsky to make the OST for this.
Personally, I don't go for the best time challenges, I enjoyed the last three stages where there are difficult jumps to make just to clear the level.
Some comments:
- it says "Z to start" but I have to press C
- if I die by falling off, I respawn but without my sprite:
- when I die, there's like half a second where I'm still moving before I get put back in start
- not sure why the game freezes when I press esc to go back to level select
Nice game!