Great game but:
1) exp system and inventory would be nice.
2) as for me, 6 tower slots is not enough.
3) pause is quite exploitable - you can pick toys on other edge of screen and pick souls from ceiling (thereby nullifying soulstealer ability) with pause.
Still 5/5
First it looks like 5/5. After an hour it became 4/5, and after couple of hours I can give only 3/5. As mentioned before, there is too much of grinding, lack of tactics and too slow gameplay. And I absolutely hated Iron Horse which took about 20 minutes to kill. Seems that 4th part of Epic War needs some epic rebalancing.
Fine concept? but too primitive and monotone. Probably game should be turn based and with more units, some kind of buildings and upgrades. 4/5 for effort.