Cool idea but the game needs a bit more effort and polishing for example after the big rockets start to come they are basically the only thing that you need to shoot since they give you so much time but still cool idea.
Well they only give 10 secs. of time so it's not much, and I tried giving them more health but it made the game way too difficult, and it's not easy as you think for most people to reach the big rockets level, personally I find it difficult to reach the end