Overall, it's a very basic game although it has apparent flaws but it still works, for the most part. There are issues when the enemies get stuck on the lower border of the screen and doesn't disappear so they pile up like crazy. Through out the time I spent playing the game none of the enemies cause any sort of damage, meaning there are no collision effect occuring between me and the enemies. The controls are fine though, the movement of the plane though ,is a bit stiff like its just dragging something heavy across the screen. Improve on that and you have a still get quite a half decent game.