It's ok, I haven't found any very large problems aside from this one: It's a bit boring, I can't imagine myself playing this games for more than 30 seconds. Stick at it though, I'm sure you'll be able to improve this.
Well, for a first game it could be a whole lot worse. Your character actually moves, there are platforms and obstacles to negotiate. Some of your spikes seem to have invisible bits, which can be a bit annoying. It might be a good idea to work on the graphics, and in general work on a game for more than 3 hours before uploading.
Good luck in the future.
Yeah, I know it's pretty boring. I'll start to improve with more games and more knowledge.