Atop the World
This song is from the game "Tower of Heaven" by Asciisoft. It's difficult to play this game today because it requires flash, but it is free if you're able to run it.
In the game, all of the music you've heard thus far was chiptune, so to hear this song transition from that into full orchestration is an amazing effect.
It's honestly incredible how much mileage flashygoodness got out of the same motifs of the song in the entire OST.
The same simple melody is used in every single track and is changed to fit a wide variety of moods. It gives the game a very solid musical identity.
This was another song that inspired me to try learning piano again years ago (another song being Lonely Lillie)
I actually ended up fully learning this piece! I got a transcription of the piano part and steadily learned it in my free time. I think that it was the first piece that I ended up learning after quitting lessons.
I've forgotten how to play it after years of not playing the piano, but I haven't forgotten how fun it was to play.