Are there plans to implement a map feature down the line? I would assume so, given the Metroidvania genre is applicable here.
Also the little fire collectables I've seen around, are those... well, collectables? Or like hidden powerups?
As for suggestions, well folks have already mentioned a lot. I guess maybe adding on to the object transformation I saw in the content settings, maybe there could be places where you can be turned into stuff that litters haunted house areas. Maybe either turned into a painting, or perhaps the painting can come alive and "eat" you to have a new portrait be displayed?
And perhaps some enemies with tails that can be used to eat could be like demons/succubus? I'm not really sure the range of enemies you plan to have for the game, but those are the first creatures to come into mind for tail vore.
A map is planned, but it's intended to be an unlockable that you get from doing a search and find quest around mid-late game. The fire collectibles are actually health pickups, so I guess you just didn't get hit lol. They're going to be a random chance drop from breakables at some point, I just wanted to throw some in in case the save run was a little lengthy in a couple places.
The painting idea is really neat, I'll definitely keep that one in mind.