Hey,
I just spent a few minuets playing this game and I got to say I'm lost.
I'm not sure whats going on but firing seems really slow, I can barley keep the blobs back because of the firing rate being so slow and then a lot of the time the background changes, the game beeps at me and all of a sudden I'm dead. Not sure if I'm missing something but this game seems unbelievably difficult and not because it's hard to master but because you just don't have a chance of surviving. My advice (for what it's worth) would be to direct the user what to do either with some instructions or slow introduction to the mechanics, also, if it really is that hard and i've not missed something, it would need toning down to make the game more playable.