This is a spectacular piece of work!
It reminds me of a far more forgiving homage to "I Wanna Be the Guy" and other challenging classic platformers that have come to past. The aesthetics, controls, and mechanics are all fairly simple but very well made and the game is something I would recommend to try for those who are up for a fun challenge.
The very few gripes off the top of my had I have are:
*Certain Visual Effects (even to those who do not have certain impairments) can be very debilitating and prevent people from enjoying the game.
*The Music (although I'm a sucker for chiptune) can get very tiresome and monotonous as well as it overpowering certain sound effects.
*I think there needs to be a "Second Jump Button" or the ability to change controls. Precision jumps that require nano-seconds and certain Space-Bars, tend not to mix very well.
Overall, you guys did a fantastic job and the Level Design is quite fun and satisfying, although, some of the more challenging ones would highly benefit from a little polish and rearrangement so that players can get adjusted to the mechanics outside of trial and error by death.