"Fond Memories" was great, but I think that it could've been EXTRA great! When you introduced the Super Mario Galaxy-esque instrument, I was sure that it would evolve into something where I could imagine myself swimming in an eternally vast warm ocean of nostalgia. This is a personal preference; I am not saying that what you submitted disappointed me, I still really enjoyed it!
Overall I think this would be great background music that sets the vibe but doesn't call attention to itself. Perfect music for studying :)