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That slideshow of all the different situations is incredible. Especially the star field.

Don't leave the sound design to the very end though! A good soundtrack can elevate a good game to an awesome game, or a mediocre game to a good game. One game that might inspire you is Radar Mission for the original Game Boy. It's a basic battleship game, but the soundtrack is incredible, and I would often play it on autopilot at the end of a rough day to unwind. (It was available on the 3DS eShop as a Virtual Console title, but since the eShop is shut down now the only way to get it on the 3DS is by installing custom firmware that allows you to sideload stuff).

Here is the original soundtrack to Radar Mission on YouTube: https://youtube.com/playlist?list=PLd_GcSlmM7zaLV3oxkUjZ9rJdYsdt8EU8

Korobeiniki is a Russian folk song from the mid-1800s. Tetris holds the trademark for the specific arrangement of the song that they created for the 1989 Game Boy version of Tetris, but the melody itself is in the public domain. If you can find a freely-licensed performance of the song that isn't based on Tetris' arrangement, you can freely use it in your game.

Or you could try to find some other music that has a similar feel to the A-B-C songs on GB Tetris. Something like Understanding It by Cabel Sasser (I'm not sure Cabel would let you use that actual piece, because they use it as the ending music for the Panic Podcast). Something with that kind of upbeat style would be a perfect fit for Playtris. Whatever you use, you'll need to make it loop somehow.

--cmmartti (frosted-flakes on Discord)