Really cool concept! Reminds me of those point and click search games I used to play when I was a kid haha. The art was amazing and the music was really well done.
Sometimes I felt a bit hard to distinguish if it was an object behind what you erased or just the opacity of the artwork. Maybe brighter colors for the object just to make them more easily identified, as Erasers felt sort of useless unless you managed to erase the exact spot an object was.