This entry has a lot of potential. The ideas here are great and it seemed you guys had a great deal of fun making it. I think some things are overly complex and more effort than it worth.
The 3D world could have been left out, the interest of this game does not come from navigation, but of the feeling of growing your army of the undead and gaining power based on what you defeat. To make these decisions even clearer, having a 2D world (or at least fixed camera) with more confines would be better to clearly see a difference in challenge. For example: do you want to fight 3 wolves, or 1 knight and 1 assasin.
The combat also feels overly complex. Units have 2 different attacks, but one seems to be better than the other. So I would suggest not giving the player this choice. The interesting part here is not what you make your units do, but what kind of units you are putting on the field.
There are some other smaller UX improvmenets that would make the game much more smooth to play: - Have the targeter auto-select an enemy. - Have an "all attack" button. - Have my premake my army or a better UI to summon them, there are too many clicks before combat really starts. - Have the status effect icons be way clearer, and just skip the turn of the guys who are stunned. For this going 2D or pseudo 2D would have helped.
Its a lot of feedback, but I am only giving it because I had a good time, finished it to the end and I see a lot of potential here!
(PS: it seems you get the summon you select as default for free, so you get 2x of the first guy you come across, after getting the sword guy, I could stunlock everyone)