Ohhhh, this is a really creative take on the theme! A game that takes place in a gallery with only one painting is super interesting, and the customisation and different paths you can take are a cool, interesting idea!
I also like how when you make subtle choices, you can only go down one path, so there's different mixing and matching you can do for the painting.
Music and sound would be nice to have, but I really like what you've done here! (Also the player visuals and how the tutorial is told to you, with the player being coloured differently depending on where you are is a nice touch!)