I really enjoyed playing with it, but unfortunately rocket doesn't seem to move with keyboard so I lost every time there. Difficulty progression is achieved, and even the platforms are repetitive, making different challenges appear helps to not feel it so. Sound is very good. I would like to point out that maybe a parallax effect on the background would change A LOT the game looks (for good). Probably one of your first games, but you did a good job there, taking the theme on an obvious way maybe, but putting effort on making something enjoyable with the resources provided.