The artstyle and music kinda reminded me of HoMM I've played quite a while ago. I think it might need to be more cohesive though.
The tutorial was a bit long for me, I got the idea way earlier than it ended. Also, not sure about the cheatsheet being always open (except for the goal).
The game got too repetitive for me to finish in one go (got through the nature and partially the fire sections). It might make a nice time killer though if played a couple levels per session.
There's a slight graphical bug: on 16:10 screen the right column of tiles is partially occluded by the panel.