The game has a cool concept and feels good to play, but it has two significant issues that soured it for me. The first is that the difficulty spikes are too rough (in particular levels like 15, with many enemies shooting in different directions). The second is the lack of any type of level selection screen or continue system. You have to play through the whole game every time you die, which is pretty tedious when the first five levels or so feel more like tutorials than actual levels.