Not too bad
I like how simple this game is, but some of the simplicity did not work that well with me. I think the weakest point is how you stay in the same place and you can not develop much strategy against the giant boss firing at you. I was not sure how to shoot, but then I realized I just had to hold the button for a longer time period. The funniest part was how I could get in different kinds of attacks. There could have been some more detail, but overall it was pretty fun to play. You really have to keep up with those bosses.