So I've played it at friend's house and... this simply doesn't do it for me. Performance is fine, but the audio... eugh.

Listen, Ubi. I see what you are trying to do, music evolving as you play, etc. But Tetris for me is Korobeiniki or other traditional Russian song, period and not some ambient electro BS. Sorry, but I rather make my own clone ofr my private use that has all the right pieces, so to speak... or just keep playing Tengen Tetris on the NES, maybe GB one as well. This simply doesn't do it for me.

And in trailer, you had proper Tetris music, probably because you knew that Tetris = Korobeiniki and not whatever you Putin there.

https://www.youtube.com/watch?v=umEDct4BoGc
This. This is Tetris.