Loved the idea! The closing circle is indeed a nice detail, makes you strive to keep the memory alive... reminded me of "The Eternal Sunshine of the Spotless Mind" :D
I think it'd be useful to have some score/feedback while collecting the memories, just to know how close I am to beating each mini game. Also, at the end I answered the question and I think that's how the game ends, but I would have liked a small epilogue just to see how my answer affects the story...
I liked the minimal storytelling and how there were no enemies. Maybe small texts to go with the pictures (or small speech bubbles after each memory) would add some more depth. But overall, it's a nice emotional game!