Very fun! I had a blast finding the paintings, And if you keep working this game up to be a full on puzzle platformer, I'd pay money for it!
The only issues that i have for it is that it's not obvious right away what you're supposed to be doing. In fact, i thought the paintings were doors that I was supposed to walk through. The other issue with them is that it's not very obvious that you're lighting them on fire until they're already burning. (the eye following effect on them is awesome).
Another issue is that the platforming does feel a little bit unforgiving. Maybe some coyote time would give it a better feel?
Overall, fun factor is rocket fuel, and all you need to do is light its fire to make a really awesome game. I like the artstyle.