It is very much possible, that the graphics are a bit murky in the area. You were two rooms away from the easiest to get upgrade though lol
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Ah interesting. I'm gonna give it another go later and check it out, sounds like an interesting concept. So a question, do you just spawn additional monsters as the player finds more upgrades (to keep the difficulty curve ramping up)? I think I noticed that the vampire things (I didn't look very closely, but they had a cape :P) didn't spawn until after my second upgrade, but maybe that was just coincidence.