I don't know why, buit I return to this game again and again. I can totally understand the comment that its good but not great, but I find it endlessly replayable for some reason...
Dead easy if you just build your ballon as quickly as possible. Turrets are worthless for their price. I did have some fun leaving the balloon alone and maxing out everything. First time ever I haven't given a game by jmtb 5/5, oh well, 4/5, it's still fun.