This game was super cool! There are a lot of aspects that I thought were really clever and played with the theme really well. The fact that your movement was restricted while you were attacking was a really smart way to get the player to think hard about their attacks and think about breaking them off. I also liked that the attacks got faster as you got to the last guy.
Some notes, not because I didn't like it, but because I appreciate constructive feedback:
I wasn't expecting the border to kill you, that surprised me. Also, I would've appreciated having health (3 hearts or something). The enemies always shoot to directly where you're standing and no further, so you only need to move slightly to dodge all the attacks (and this gets easier as you thin out the numbers). Also, the game starts once you kill the first enemy, but not when you damage an enemy, so I could just go around and damage all the enemies until they were almost dead before killing the first one.
I had a lot of fun, and this is really great for a 48 hour game. Congrats on your first itch submission!