Very nice jam game, quite polished for a solo project. The crunchy pixel style works well, your UI communicates nicely, there's some solid juice and gamefeel. I do think you could do a little more w/ the hero mech, it looks a little stiff, maybe leaning or some squash/stretch to amplify the feeling of movement/momentum. The enemies look nice but could use some more variety, specifically in their attacks/movement. They pretty much just show up then stop to shoot at you, it would have been nice to have something more mobile or maybe flying units to mix things up. The target indicator seems to get 'stuck' on enemies, even if i move and target another it stays on them too long (even while my bullets go at the one i have moused over), not sure if that's a bug or intended behavior.
Overall great work, easy to hop into and satisfying to play, nice job!