Very simple, however, nonetheless fun. I did liked the radius themed enemies, since while they're weren't cleverly designed, they were at least a cute force to fight against. Along with that, the controls were tight, even if I'm a smidgen disappointed sliding wasn't added, if you happened to let go of the arrow key. Aside from all that, a few cons. Some of the power-ups, such as health, spawn too frequently. I would like it to spawn much less often, and on the higher up enemies, so you have to risk more health just to regain some. Other than that, I'm highly disappointed of the lack of a high score counter.. I'd love to beat others.