You nailed it with the description, it sounds really nostalgic! I dunno why but songs in C and F minor are usually already kinda nostalgic to me, but the pads with the slow decay really amplify that feeling even further. And so do a lot of the other instruments you use, they have a similar profile to those from the 90s. The nostalgic part however is only one of the many reasons I like this song though...
The melody is amazing. Atmosphere wise it's both relaxing and adventurous, curious and calming, and introspective as well. The progression from start to finish feels like a journey and as I watched the timer get closer to the finish of the song I didn't want it to end so badly! Everything just sounded so beautiful. Amazing work, keep it up!!