I am pretty far, just revived a guy being attacked by black wolves, and then entered a temple. I fought a knight who popped out of a tomb and after beating him the doors didn't re-open. I'm stuck in that room. are there bugs?

Been a while since I played, but that sounds like the cemetery. You do run into a few cases in the game where you go through a door and it locks and stays locked making you go forward or you fall down a pit you can't go back from.

Anyways, from what I recall I think you're supposed to go through the tomb that the knight popped out of.

I only finished as conjurer a few days ago, and I didn't observe any bugs.
Saving a guy from attacking black wolves, was that in the snowy/ice area and did he ask for a healing potion?

I don't remember anything difficult there.

Are there are switches on the wall, or elevators?
Or maybe you have to find keys to move on, or look for floor plates to trigger something?
You could also look for loose walls to bash through, though I think this would be only for hidden areas but not essential moving on.

I think I know which point you are at. A bat comes out of the tomb, which turns into the knight. After defeating the knight, it turns into a bat again and you need to kill this final bat form before the wall opens again. The tomb also drops a key on the ground when you open it, which you will need later.

For a spoiler on what to do here, watch this Youtube video:
http://youtu.be/fHnLK9S87Qk?t=42m24s

is there anyway to place this game on a chromebook?