That was really good for a first submission! I think that the platforming was good, and the gravity made sense, but it often made enemy attacks impossible to dodge. I feel like it would have been a little more fair if either I had unlimited ammo (I noticed that bullets will collide with enemy bullets), if there was a double-jump or fast fall option, or if I could aim in more than two directions.
Even so, I was able to get through the first stage and get fairly far into the second.