it's ok
This is your first game, it seems to work, which is a good sign. graphics and game-play wise, it's pretty basic. Though compared to other games factory games i've played, this is reasonably good. I had some fun playing it, but it got too hard by the 4th level. The controls are quite a problem, not that they don't work. It's just the movement of the character, and the fact that you can't stand still and jump. So about the movement.. he moves way too fast. It's hard to land on platforms because you could be in the air and know you're not going to land it, then be like "hmm i'm gonna have to press the other direction". Which would generally lead to the character flying away down a hole. I know you can lightly tap the buttons and get him to move more subtley, but pressing it reasonably hard with your survival reflexes will kill you. It might not be the speed of the character perhaps, but the acceleration/deceleration. So if you changed directions speed wouldn't be at full instantly.
With some more interesting graphics and gameplay elements, plus better movement control, this could be a pretty good game.
At the moment, overall, it's decent. The music which i haven't mentioned yet is great, and it was made by you. A good first attempt at a game.