This is a fun idea. I had a bit of trouble keeping track of what was going on and felt like I ended up just clicking at random. It was unclear to me what the rules for trap placement were. Sometimes I could place them and sometimes I couldn't and it didn't seem to have anything to do with how many souls I had. Maybe it was preventing me from stacking two traps on the same square and I just couldn't see there was already a trap there?
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Thanks for playing and the feedback! Do you remember which traps felt the least consistent? The two main rules are their soul cost and orientation. Traps that are placed on a wall obviously need a wall that's not being used by another trap, but there are some other use cases that aren't visualized well.