Thanks for all the feedback, this is awesome! I had some friends playtest last night and we found most of these bugs which have been (hopefully) fixed in the down-to-the-wire build - I probably should have disabled the v1.07 build while I was fixing things but I get nervous about gamejam submissions.
Anyway, the keys thing was cause the code was looking to see if you had exactly 5 keys, which is obviously a no-no, so I've since changed that to >=5, but also fixed the thing that was giving you multiple keys in the first place).. Also the game is now beatable and much more user friendly if you don't have the right amount of keys (Tumbler Rooms reset to the optimal configuration, etc...)!
Some of the collision bugs have been fixed, some I brute forced by adding extra terrain, but there are undoubtedly those that haven't been fixed yet. If you're feeling up to it, you can give the game one last shot and see how it goes for you. :D
I've been looking forward to playing your game from the moment I saw it's called Dragon's XXX, but I need some time to unwind first, I'm gonna try to get through all these on the weekend.
Thanks again for all of the feedback, truly appreciate it.