I call this a "platformer". It's just a play at certain mechanics. Space to Jump. A to move Left. D to move Right. Enter to Enter Exit Doors.
If you are interested in the source, there is a link for it. Note however, that many functions and variables have been left, even though they are not used. Feel free to tinker with what's left.
I wouldn't call it very organized source-wise (I don't think you would, either, judging by "YOU WON BECAUSE I CAN'T FIGURE OUT HOW TO CHANGE LEVELS"), but it's playable and that's good. With a little bit of variable tweaking in the player physics, it could feel much smoother. Move some code around and make it a bit more workable and multiple levels and movable entities (should you wish to have them) are easy.
Pretty tight game. Controls feel solid, graphics are pretty nice, and camera movement is great! Would have liked more levels. Walking animation was very well done. Keep it up!
Nice put together, though!