Found out how to make snow, probably easier ways, but: Make a bunch of ice as a main floor(as in half the map full of ice) Add some lava into the huge mound and make sure it keeps its heating melting the ice. And after it's all done, on the top there should be lots of white snow.
Well it went by so easily, as I'm typing this I'm still playing. Tesla just makes it a easy walkthrouugh. Making it have more monsters would make it much more fun. I started finding a ton of survivors in the 2nd area. Oh crap... Just lost.
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 "UPGRADE COMPLETE!"){kind=icon}
 "Zombies!"){kind=icon}