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Well, I managed to pass the first level with 20/20 and don't think about monster rebalance. but IMHO upgrades could be available on every stage. It'll make the game not so hardcore for newbies and more interesting for skilled players.
There is something to make better, but it's a really fresh and interesting TD for me.
4/5 for now.
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Hm, well it's okay but...
The money you are given at the start isn't that much. I also wish there was a bit less health for the Joltik considering they were your first enemies, a tad unoriginal but you know what? It's still pretty good.
3/5.