This is a truly inspired story. You've blended reality and gaming in a touching way. This was a light hearted tribute to a well deserved little robot.
I would love to see more games with real paintings used as assets. One note on that for the future if you are photographing your paintings you want consistent light on the painting, sunlight is normally the best. It wasn't distracting or anything, but I noticed some glare on the right of the starting location. I think with a piece like this the lighting could really change the mood and feel of it. I like that it was bright, but I would be curious how it would feel if you photographed your paintings in a much darker space.