Questions in DONTFORGET

sans is from...

Ness is Sans?

There are 3 puzzle pieces I cannot find. In the dont forget wiki i see three in an area in snowdin I cannot access with papyrus standing by a sentry. How do I get here?

Hello. I've already asked what are glitch tickets. And now I wanna ask where can I get them(except the daily gifts)?

Hello. What are the glitch tickets for?

the client gamejolt does not open

Is this true Dont Forget gonna dissapear in the next year..?

my right arrow key is broken, so i have to play the game with WASD, is there a way i can change it?