I like the levels, and the stats and items are well made. Magic seems to be useless, though, or at least I didn't find a use for the single spell I found. It is also hard to cast with the drag&drop. Overall, the game could be a lot more user-friendly - add shortcuts, maybe rework the wings? I don't like having to start 10 levels behind with mediocre items.
This TD is like a puzzle - you have to find the right combination of towers to kill everything, to collect the money and to find the next combo and so on. If you start missing mobs you eventually fall behind on cash and start missing even more.
There are a lot of inconsistencies between tooltips. Being a huge gemcraft fan, I can't say this game surprised me with anything, but it's still enjoyable.
Added to favs, I like the upbeat tune and colorful graphics. Gameplay is pretty neat, too. Only thing that bothers me is how easy it is to lure the AI in a multy-pax situation and then collect all with a few cards of the same family.
Needs a lot of gameplay improvement - maybe switch to turn-based, add hotkeys, add place to store unused troops if you gonna add challenges for specific units. Maybe add auto-attack for units? Otherwise pretty good, maybe add spells that are not unit-related but used directly.