There are a LOT of really interesting ideas here.
The slimes splitting if you hit them with the shotgun, unless they're frozen? Fascinating, caught my interest immediately. The different elements and needing to be careful how you used it was pretty neat, but it seemed like I could only carry two guns at a time, so that worked somewhat against the spur of the moment picking. On the whole, this is a really great entry, I think you should be proud!