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I quite like it, it reminds me of an 80s Games Workshop board game called DungeonQuest. One note though: the tile depicted usually doesn't match the one you pick up (e.g. you click on a straight corridor and pick up a dead end square). Is that intentional or a bug?

Yeah, the tiles not matching is totally a feature... I mean bug.  It has to do with the game not realizing there's already a tile on that spot and stacks a second one on top of it.  When you click the tile you have a pretty good chance of getting the one on the bottom.  Just chalk it up to the Game Master being a jerk.