Really like the idea! Throwback to the days I played Diablo2 :) Map looks organic - well done. There are improvements I'd suggest - 1. UI of the shop can be improved, as well as interaction with trader, maybe on button press would be nice. 2. Attack is a bit OP as you can attack as fast as you can click and distance is further than attack range of the green enemies.
PS. there is just 1 level, right? Would play more with pleasure :)