Hi. That sort of helps. When I read the instructions to roll on the current table and "if you roll an event or a duplicate creature,..." I hadn't taken the Dream Eater to be an event. The table (Fall) calls the Dream Eater a "special creature" and further down, lists Unimaginable Horror as an event, so that seemed to differentiate them as separate categories. I took the Dream Eater as just another part of the bestiary, though perhaps stronger than average. I didn't see it as an event.
For next time, does Mutated then simply mean adding the scores of two creatures together? Including Health?
For my Aura question, I did play with it granting me a bonus, despite how it was written. I made an error in my first post: I wrote that I had Aura when I meant to say I had Indifferent (page 32).
Perhaps consider rephrasing Indifferent (currently "You are immune to enemy Aura") to something like "You have an aura of protection against certain enemies."
At any rate, the game is enjoyable. I have tried my hand at making games so I know it's not as easy as some might assume. I happen to think this is quite well made, even if there are a few minor points to touch up. I plan to recommend it to others.