I have conquered this game, gg well done Daniel this was a blast!
Final score 8/10, simple but tactical, with a lot of small touches, such as the minotaurs acting shocked when you open their chests, really making the game memorable. I'd suggest making it possible to access the mark mode by pressing a button on the screen, that way it becomes playable on touchpads too.
I think the lack of explanations for monster placement kinda works in the game's favor, adds a lot of replayability.