I adore the concept and visual design of this game! In general, this game is fun, interesting, unique, and has a ton of potential. That said, as is, I think the rooms are a bit too simple and the jump mechanic feels a little off. If you were to clean it up, add more levels/galleries to explore, and make the levels more challenging, I think this could make a great full-fledged game!
I can easily imagine a version where you have to complete a larger painting - or paintings - and there's a really cool section where you have to outrun and dodge parts of the collapsing gallery. And you could have vague hints as to why each "painting" is significant and why our character wants to complete them. Then there's the replay value of finding all possible parts of the paintings...
Ahhhh I really need this to be a full game!