Developer response from Spicyhorse
"That IS mysterious. So they are visible.... then they become invisible..... then they become visible again ??"
This also happens when i play....i see other people are having the same problem, i just assumed it was part of the game? Why are they disappearing?
Im pretty new to playing this game but id have to say there arent enough people playing it. The wait times are unbearable...If there are diff players in each server, i suggest joining them to get more players in 1 main server
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Like Dratonus says below, the enemies do do that on Ghost House and Arabian Night. I incorrectly assumed everyone knew that :) Silly me.