Cavern Commander

I agree with Roberto's comments: a game that deserves more levels, but is fun anyway!

Despite only having a few stages (approx 5), Cavern Commander is a fun game. You have to get your ship through the level and land on the pod at the end. After you finish all the stages you loop back to the start with harder enemies (similar to Donkey Kong). Although there isn't a great deal here, it's definitely worth a look.