I do have a piano section in the middle. But it turns out I cannot figure out how to mic a grand piano, so the actual audio is from Keyscape. So that part of the video is a lie, but it shows the intent. I just can’t figure out how to use microphones.
Mic'ing up a piano can be a tricky business, but here is a very quick article to get started
https://mxlmics.com/micing-a-piano/There are loads of youtube videos etc about this. Generally speaking, using 2 microphones (or even 3) is the best way. There is no absolute way to do it, a fair bit of experimentation is required - mainly due to the room and position of the piano.
From my (fairly limited) experience of this, if you can get 2 mics on the go you will almost certainly be able to achieve a nice recording, once you figure out the best placings and distance from the piano - but the guide above is a good starting point.
Regarding using microphones generally, it can seems bit daunting at first, but actually the general rules still apply - it's about finding the right position really for whichever room you're in and what it is you are recording. Distance makes a big difference, even a few inches - again like I say, my advice is to follow the basic principles, but experiment with it too - there's no real right or wrong as long as it sounds good in the end.
Nice tune by the way!