Hiya! I think I reviewed a work of yours some time ago, and it also utilized a sort of piano vst. Not really sure what I recommended there in that, but I'm here to review this one, not that one.
I can only point out two things that could definitely be improved upon in this track since once again there is only one instrument in it. ._.
Dynamics. Please use them. If your piano vst does not have some sort of setting where you can control the velocity, hammer strength or whatever then it is not a piano vst worth investing your time in. Effects can have a minimal effect (haha) in addressing this issue, but you really want to have something that can operate as a pedal for dynamics, like in a real piano!
Second, no piano player, not even the best in the world, can play a perfectly quantized piece. Try to give your composition a little "humanness" to it. I'm chiefly talking about mimicking the effect of human error. Move some of those notes around a little bit so that they are just ever so slightly off beat. I'm not talking to the point of the whole piece sounding arhythmic, but just a liiiiiiitttle bit so that it can have a little humanization in it, even though you're kind of faking it.
That's about all I can think of in terms of a solo piano performance on a vst, really. Hope I helped a little bit!