I really enjoyed this for the fun simplicity of it. If it had a save feature and a more readable mini map (is that a mini map in the bottom right?) I'd probably keep coming back and playing this one.
It is, in fact, a mini map, but you don't have a whole lot of control over your movement. Each square on the minimap is at least 2 maps of space, and you can't ever backtrack without finding a loop or casting return. Your only overworld movement decision is whether to take the grey or white door when both are present-- they will generally lead in the direction that would make sense, but you can check the minimap for that as well-- there's no marker for where you are, only where you can move next.
Don't get me wrong, I enjoyed this game. There's some good stuff going on in there and the one boss I managed to beat was fun and engaging. I just couldn't figure out where I was going. Now that you're explained the map, that's also interesting and would probably be an interesting puzzle for a game that I would invest more time in or a competitive game ( imagine the advantage if one player figured out the map first ). It was just a lot to wrap my brain around for a jam game.
I hope you do something with this, I'd really like to see this get developed further. I'll definitely revisit it.