Seems to be a nice, meditative game but I have no idea which keys to press except wasd,space,esc. At least F1 should show the keyboard assignment...

How do I save or end the game?
I can only run around, jump and dig. After running around for a while I could only quit without saving. So it seems I cannot continue the next time and have to start from the very beginning, and that makes the game boring.

The game only autosaves when you enter a new area/chapter. There are 5 in the game, and the whole game is about 2 to 3 hours long. Other than WASD movement, mouse button for interaction, and space for jumping, there aren't any other keys to use.

Late reply but in case anyone wonders what the keybinds are and where to see them, they are the ones above post just mentioned, as well as additional shift to toggle run on and off, and zoom in on ur character a bit with scroll mouse.

They are shown to u on the screen at the very beginning right after u leave the den.

A tip , it seems strafing makes u move a little faster than normal running, not sure if this is imaginary or not but its sure felt like it for me:)