Cool game, I liked the tower-defence style mechanics! My playstyle was to pick up most of the ice except for a two-block thick platform under the penguins, which I then covered with turrets. I played till like 10 waves around, probably more. The upgrades system is nice and although I used one particular strategy I can see how people would have varying playstyles for this, which would add to the fun. My turrets demolished all the enemies after I added like 15 of them, which was pretty satisfying because i almost died early on. Good job!