Definitely one of the most original and interesting premises for the jam games I've played. Experimental approaches to horror are the best. This oozes atmosphere and I love the sci-fi premise and inherent claustrophobia, punctuated by the slow pacing. This can be a bit repetitive, but when things go wrong, there is that dread, especially of having to exit the drill and go out into the cold, lonely emptiness of the tunnels to fix things. Definitely immense potential to build on this, as others have said, some quality of life fixes could help. But fundamentally, the game achieves the tone it sets out to create: there is the player, there is the machine, and there is the sense that in this job the player is resigned to, they are really cast out into the fringes of human survival, alone. Enjoyed the special encounter with the visitor at the end!