As you see the sprites are at unusual angles. This happened after I changed the material used for some sprites (a sprites/diffuse one) and closed unity afterwards. Next day I come back to see this.
Have you tried tilting your head the opposite direction?
Just kidding. What kind of changes did you make to the material? Does returning it to the default material fix the issue?
camera got slightly rotated?
I just changed the material to a sprites/diffuse material and changed them all back to the default material to notice no change.
Nope, it seems like only the sprites have been angle at an angle.