T to toggle the darkness meter. (Mainly implemented so that you can read the text in the game, and to also tell you when you're completely 'in the room', which is 0% darkness.) 0% darkness is very necessary for many things to function, like non-collidable blocks and buttons. You can use this to your advantage though, as you can make non-collidable blocks collidable. Be warned that exploring the wrong way may lead to a softlock. Clicking 'o' will create a share link.
PROGRAMMER TERM: SOFTLOCK A softlock occurs when a player gets stuck in a room, or lags out. In these cases, the game must be restarted. STS project this is a re-enactment of this other game from earlier big undertale thank-you
