Nice concept, but I have a few changes that might make the game better.
1. Make the mouse and the walls that you go through more flashy. [ ex moving fire, running water ]
2. Make more levels!!!!!
3. Make the ending more interesting then fireworks. Maybe incorporate the elements into the ending.
Above all, continue with the idea it's a great one. I look forward to playing the finished product.
I found a bug. as soon as the enemys rocket hits you and you try to move at the same time it teleports you into the space not a planet and you stay there. you cant shoot bu ur invincebal