Thanks. Glad you like it!
For multiplayer, a hotseat mode could be doable technically, but gameplay-wise the game would need some changes in the rules to avoid stalemates.
For the one cleric + two barbarians team or three mercs team, indeed it's OP :)
Other kind-of OP combinations are 3 mind controlling witch-doctors, or 3 grappling barbarians -> you can do whatever you want with the enemies.
I had some fun too with one cleric and 2 skeleton-rising witch-doctors -> a bit of set-up to rise enough skeletons, but then with the inspire ability from the cleric you attack with a whole army at once.
I don't know when/if I will have time to work back on this soon (another game in progress, and a happy, but time-consuming, family event 👶 recently), but could try to do a fix+balancing patch at some point.