So, since nobody responded to your recent release yet, let me give you some feedback.
I think I can roughly approach this in two ways: 1. look at PoP Unity as a potential level viewer, and 2. look at PoP Unity as a potential full-fledged remake. When I look at PoP Unity as a possible remake, especially when I'm taking into account your plans to include XML support, an in-game level editor and whatnot, you have a tremendous - incalculable, really; fighting with guards, for example, will be a pain to implement properly - amount of work still ahead of you. So much work that it wouldn't surprise me if just thinking about all that work might seriously demotivate you.
Therefore I suggest a more step by step approach. I'm going to assume this is "PoP Unity - A
level viewer in the Unity Engine". When I look at the program as a level viewer, you're actually making good progress. It's still complicated to use, especially without reading the accompanying instructions, and some tiles appear to be missing (like gates), but the program has potential. If you keep working on it and make everything very user-friendly I might use it occasionally.
Some people have asked for a way to get an easy overview of levels in apoplexy (
example; Coco also asked this via
PM), and apoplexy could theoretically launch an external level viewer for that.
I think my feedback/advice is to focus on really polishing what is currently there before you move on to other things. Try to make it usable without a manual, allow people to use the scroll wheel wherever it makes sense, allow people to drag things where it makes sense, and so on. Then keep asking for feedback and try to improve what's currently there based on the suggestions you receive.
Is the source code only readable with Unity? I didn't find any source code in the ZIP file, but did find a software license that seems to suggest the source code should be available.
[Edit: To prevent misunderstandings, I'm not trying to prevent you from moving forward to features beyond displaying levels. I just know that, frequently it's more fun to work on new stuff than to fix bugs and improve what's already there. And the latter could become a bigger and bigger pile of unappealing work if it's not taken care of first.]