The level generation can result in repetitive gameplay, but the movement is very fluid, the audio is nicely implemented and the visuals go for a cool retro look.

Solid game 👍

This was satisfying to play, but maybe a bit too satisfying. I did not feel any pressure; difficulty, if it ever increased, was always too low, most of the time I played with one hand as I run in a straight line anyways, just holding W and pressing jump occasionally. I like movement implementation, it feels great, smooth, intuitive, but this movement system is not put to the test at all. I would greatly appreciate a more complex level design, with having to turn, jump up in spirals, run off ledge without jumping to not hit and obstacle above, etc. If you go for scaled difficulty, it must be expressed more clear. The incentive is too vague, there's no visual marker on finish of any kind, and I didn't understand what percentage on the screen means. 
I find visuals very nice, style is solid and consistent, creates very strong atmosphere along with music. You could add some SFX and sound cues to movement, that would also help with feedback on movement system. Overall - cool game, I enjoyed playing this, good job!