here are a few thing I notice.
1: No tutorial, the game does nothing to tell you how the different ammo types work. on level 8 where you are given the what I'm calling a spread shot, I had no clue that it was to be fire at open spaces, I shot it at the enemies, the blocks, it was not till I tried just firing above the enemies that I learned how it worked.
2: you know this already, but I'm just going to say this again, the game ends too quickly after firing the last shot. I again learned this in level 8. 8 shots, 8 enemies, an after killing the last enemy with the last shot, the fail notice appears, even tho I killed every thing on the screen I was supposed to kill.
I would like to rate higher, but the game grinds to a halt on Lv 8