The game is definitely super simplistic in terms of gameplay. Since the bombs never go above 4 in total spawns at once. Along with there being two, very distinct bombs to dispose of. It is very easy to get high enough of a score to unlock all the costumes!
A good game if you are looking for a cute, chibi, anime girl and about 3 or so minutes you want to kill!
Honestly, the cute girl was the key reason why I played this game :P