I had fun playing it. I know i am a bit late.
I have a few tips and ideas on how you coud improve / hammer out some of the flaws in this game. Its a game jam so for next time. :)
I ran into the same problem as Goof Sosiska.
Since you probably did the multiplying in sepperate steps you could check if the value gose down and then set it to max or infinit.
I have made an observation thats makes playing the game at the beginning. If you try walking in circles you cut of your own way back. I presume you override the grid with a new room egnoring if there is a room allready.
Again i loved it. You did great work. :)