Thanks!
And thanks for the QA testing ':D I was aware of the respawn bug, but forgot that it would hard-lock the player on the first boss, or else it would have been much higher priority for me to fix.
It's intentional that you die when you go out of bounds (go to a room coordinate that doesn't exist), you are just not supposed to be able to climb that wall, good find! I think the reason you are able to do that is that the black walls lack a script for collision at the room edges that other walls have, I just forgot to add it for them.