This game is Extreamly Awesome! I Really loved to play it. I didn't finish because is hard, but if you launch this game a full releease with Level editor and sharing online, color schemes, more type of obstacles and a level selector I'll totally buy it ♥ Also you made it with Java, not any game engine and that's something to laud. You must be proud of this game, right?
Is it inspired from N+? It reminds me a lot of it