Oops!
Seems like we managed to bug out our game right in the tutorial. While waiting for a more definite fix, please enjoy patch 1.6.4.1 which adds a little extra dispenser for you to pass the bug, or, alternatively, a chance to skip the tutorial entirely (just click "abort dungeon" and then select Skip tutorial!).
Also fixed a super-late game issue while I was at it.
Sorry!