Is there a power up to (temporarily or permanently) increase the range of the torch? The viewable area seems really small; I know it's kinda the point with the whole atmosphere but I don't know if I could stomach looking at such a small area for so long.
Yes, there are 3 power up's. Movespeed, light and sight.
What movespeed means is clear.
By upgrading the light you increase your light range.
And with power up your sight you will be able to see things as some glitter in the distance, like gold, doors or the exit.
You collect gold in the levels an can buy this power up's in the Shop.
All these upgreades are permanent.