THE GOOD (what i liked, and what stood out for me):
the art style was great. lovely sfx and a well thought out idea! I like the swapping mechanic, and the game opens for some interesting challenge. I firmly believe that this game would make for and excellent mobile project.
THE BAD (what i disliked, the bugs, and other problems):
There was a bit of a delay with button presses, so you can't get very precise with the movement. this is especially important for a game like this. The gun guys are wayy wayy too op, especially next to each other, so improving the actual randomness would be a good idea, check out gmtk's video on it!
THE HARSH (stuff that would just make the game better, usually just personal opinion, don't take it too heavily :D ):
add some game juice to enemy deaths, make the actions for killing or getting points impactful for the player.
OVERALL triple 4. nice!