as a producer who's been working with soundfonts for many years I can spot two instruments here, both Celesta and Drumkit that came from the SGM-V2.01 soundfont. The celesta is okay but not the drumkit, there're way better free drumkit samples out there, these soundfonts such as Arancho Soundfont or SGM soundfont sound great but are supposed to be a replace to the Windows Default soundfont in order to make midi files sound better. The remix itself is great, keep doing what you love my man!
this is absoultly AMAZING! I love how you went through all the worlds themes/musical instuments to show how it would sound in every world! you sir... need a lot more subs for your hard work... and I'm contributing to that. SUBSCRIPTION aquired! hope to see all the stuff you do in the future because this theme is a nostalgic trip for me and I've looked so much for people's takes on this and you are at the top of my list now.