(This is also a good demonstration of how, despite looking like just some random horny Vita game, Dungeon Travelers 2 is very much a game made with seasoned DRPG fans in mind.)
No, you are not reading that map wrong. That is a maze of one-way walls—each step you take in that grid is followed by a wall popping up behind you to stop you from going back. Naturally, it's impossible without knowing ahead of time to figure out which path leads to the middle door where progress is found and which ones will just send you to the teleporters on either side that force you to start again.
Also, the retreat system in Dungeon Travelers 2 makes you take a step back when running away and prevents you from doing so if you can't, so if you get ambushed by instakill monsters that wipe out half your team (which will happen sooner or later if you don't know to prepare for it) you're SOL.
Oh, and see those red X icons1? They're landmines that do like a third of your HP ifwhen you step on them.
The scariest part is that if you're at all familiar with how this particular subgenre works you know this is just the tip of the fucking iceberg when it comes to how sadistic dungeon design gets in them. These kinds of games are not for the faint of heart
1. Not counting the one in that room off to the left, I've completely forgotten what that one is