no way this is your first thing, actually nuts! im a sucker for funky piano nonsense... this fills the desire pretty well.
honestly the main thing id do is just add More Stuff such as synths or more drums, and add some extra variety in the dynamics. look into stuff like tutorials on mixing and layering and whatnot to play around with for future tracks, but this is pretty good as it is!
music is a very personal thing. dont be afraid to experiment with stuff ya like ;3