Loved the art on this one, particularly the train and the animation as it arrived and the level started. I also liked the detail of having the glass cracks in the corner to represent the mech's helmet being damaged as you're hit. Pretty cool little shooter! (pun intended)
Sound on the AK was pretty satisfying - would've loved to hear more sounds though!
Edit: Forgot to mention the tutorial screen you created. There's so many jam games that have no controls explained or written on their page that are tricky to figure out. This game is pretty self-explanatory but I think the inclusion of that tutorial screen made sure everyone was on board and was a pretty fun take on these sorts of screens. Loved the art style there, almost wished I saw a bit more of that personality in the actual game!