I like it, I can't quite figure it out I'm afraid, but the setting, the labyrinth of tunnels, the ocassional glowing runes. It feels like theres a mystery here and it does draw you in.
However since there is no map and the tunnels look quite similair it is a little frustrating finding you way. Having found the dash rune I felt like i was making progress, but I managed to bug through the ground somehow and the only way to fix it was resetting. I couldnt find the first rune again since I had no clue where I found it the first time :P
If you develop it further I'd suggest adding some unique landmarks, or maybe small etchings of the runes in the walls close to the corresponding rune.
Either way its very cool, good job!