Powercore by Lord_404 2017-08-04T19:50:45Z
Also got stuck on level 4 because of the missing powerup, but restarted the game and played until the room with the exit right below the entrance (after you learned the dash move). I got incredibly frustrated at the first key level, which was way too hard in my opinion. I eventually beat it though. Solid platforming game with a very steep learning curve.