Yeah, a lot of those have to do with the duplicates glitch which I just fixed the other day. If one clone hits a wall, neither can move, they both detect items, they can both enter doors, and the clone is usually off-screen.
Fixing the other bugs will be much easier now that I Cleaned Up My Codebase and can more easily pinpoint these problems.
Hopefully build 5 will have all these things resolved! I'm dedicating next week to fixing every single bug so far. (Congrats on the new computer by the way!)