Got an infinite loop going with a single Launcher and 3 lasers. I'm not going to keep it going because that would be boring and there's only 3 shells on it. XD They're just hitting up and down.
Needs some ambient music to top of the entire experience, probably something really soft and quiet at the beginning, and louder as you progress through the game. Otherwise, very good. 4/5 from me.
A 5/5 assured. The difficulty is what makes this game fun. I only had a problem with a few levels, but I got hang of them once I started paying attention.