R4R, but this isn't going to be any normal R4R, no no no; since this is also an NGAUC entry, I'll need to give it a proper review :)
You seem to be pretty good at piano! Better than me, at least, as you can actually pull off rolls and trills and octave runs :/ Was this a freestyle or did you write it first and then go off the music?
The rubato sounds very natural as well! Although there are a couple spots where I get a bit disoriented by the tempo (ex 1:07 and 1:22), in general the accels and ritards are very clear and definitely enhance the piece! Of course, all part of your ability to play piano, right? Oh, and by the way, the 4/4 bars are at 1:19 :)
I'm no expert in waltzes or any of that stuff so I'll just refrain from commenting there
Do I have any criticism for you? I guess maybe... more interesting harmonies? I felt like some of the notes you played were a bit harmonically dull, if you know what I mean :/ Try harmonizing the melody in the right hand or using more major and minor 7ths every now and then. I don't know :/
Overall, very nicely written and played piece! I've written solo piano before, so I'm not exactly new to the sound - but I have never written or really listened to waltzes before, so that's definitely new territory! 9/10, 5/5, good luck!