Hello!
I died a couple times in the beginning very quickly because I wasn't sure what was happening - having some sort of main menu screen would have been nice so I didn't get thrown in the action right away and die without knowing what was happening.
I also just spammed the shoot button, I'm not sure if I was suppose to care more about my ammo or not.
Lastly, a kill count/scoring system of some sort would have added a lot - something to make me feel like I accomplished something while playing :)
Thanks for submitting!