Ok for your first...
For your first game, it wasn't too bad. Hit detection could use some work and jumping should be revised, including gliding. If you wanted to make different power-ups, (your umbrellas) make them different, but balanced. It is also sometimes hard to discern tangible objects from the background. The background should also be tweaked a little. I once saw a door covering the bottom portion of a window once, and another door right in front of a few boxes. In fact, I found that I could jump on doors, but not on the actual building. As for controls, make them smoother. I tried switching directions a few times, and the character completely stopped when I suddenly pressed the left button while running right. In another matter, I was not challenged at all. Maybe I got lucky?