I really like the fight style!
A few bits of feedback/wishes that I have:
1. A small tutorial would be nice, or even just a bit of text explaining the mechanics that the player can view (I tried to play it like HOMM3 but there are a few differences in mechanics that affect the gameplay, and I wish I knew about them without losing my units first)
2. Ambiance sounds are nice, but a bit of background battle music could make it so much better!
3. A small bug I found: when returning to the main menu and then starting the game again, it resets the victories, but not lives.
It is nice game at this stage already, good luck with further development!