Visual style looks pretty good. Enemies felt a bit too tough health-wise, so gameplay felt a tad sluggish. At one point I also fell through the terrain, still able to use the time stop and throw stuff (though they didn't arrive at the enemies) - I was at low health, so this might've been the death state?
Health being persistent through waves makes every mistake punishing, which I like. The gimmick of switching weapons didn't feel that impactful, however - you still just tossed whatever you had at enemies (unless it was their healing weapon). The grenade felt too hard to use, and it felt like the acid did very little damage. I barely used the slow motion.
Decently enjoyable, though, well done! It could've used music, but it's hard to get to that in a game jam :)