Hey there. Am I correct in assuming you cannot save in this game? Have to beat it in one go? How long? thanks

Does anybody know what are the 5 hidden achievements

I find the default keyboard setup very awkward. If you're going to use WASD for movement then having to use Left+Ctrl for the pickaxe makes it hard to hit this while you're moving. Ctrl is usually for something like crouching but isn't meant to be used as much as it would be for the pickaxe. Suggestion is the default WASD uses space for jump and right ctrl or right alt for the pickaxe. Probably a better option would be to use arrow keys for movement and leave space and left control the way they are. Thi...