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Already submitted a bug report ingame but just wanted to report it here too:

Im in the new region (Serpent something) and the tower shows me one missing enemie in the Volcano Mouth Temple BUT there is none. Checked it 3 times now but nothing is left. Would be nice if you would look into it :)

PS: Awesome game so far!
Thank you for reporting this issue. It seems a few other people have been having the same issue. We are investigating it.