Game was fun. Sometimes accidently hit Space or Up at the wrong time because I would forget Space is shoot, not an alternate jump key. Got better after a few rounds. I like that there was a variety of things duck and avoid and even shoot. I made an infinite runner too, though it's much simpler, with jumping only.
You might consider adding WASD/left hand controls and definitely music -- an 8-bit sound track would go good with your visuals. You can find a lot of free to use creative commons on itch or other sites like https://opengameart.org.