Not gonna lie to you, that was honestly amazing. Over WAY to soon. (Not that you should make it longer, just that I really enjoyed it and may or may not have been playing it on repeat).
You have a brilliant idea, starting with the synth leading in to the general beat of the song. It hints at the idea of the song, but still leaves surprises to be discovered by the concert piano later. However, would say the synth has a tad too much reverb. That being said, it's clearly a stylistic choice that I completely respect. I do think it cuts through and adds another layer later on, so I completely understand that choice.
Your beat... I wanna say the word is hilarious. Not that it's funny, but it just makes my smile and laugh. It just puts me in such a great mood. You clearly have expert control over whatever program you use, which is pretty awesome. (I use Mixcraft, so I'm just pretending you do as well).
The bridge around 1:50 is amazing, and soothing. Yet, it prepares the listener for the repeat of the upbeat rhythm to come.
Your use of decay is soothing. Your bass? also incredible. I would honestly say this is perfect for what you set out to do.
I'm so sorry this isn't more useful- I just don't have very many criticisms at all. It's clear from reading your responses to comments that you're your biggest critic. When it comes to this particular song, I hope you're more than satisfied- because I sure as hell am. Keep making!