Just bought this and played it the entire evening - this might just be my new favorite handheld Tetris!
Runs beautifully on my Anbernic, I love that the height of the playing field covers the entire screen, the extra modes are super fun and varied, the mechanics are spot on and I love the minimal, but very professional aesthetics.
But most of all I´m loving the skins! Gameboy, TGM, minimal, monochrome, even the TGM "bone" sprites are available. customizing the background color is so enjoyable. I also really like the TGM-style outline around the pieces.
The way highscores are displayed are also very convenient - the menus in general are super snappy and intuitive.
If I could ask for just one feature - do you plan to maybe include the option to play on a narrower width playing field (similar to, say, big block mode or the surivial mode in Tetris Axis) and / or a lower height field (like in Tetris DX)? I always enjoyed these modes a lot!
Anyways, I´m super impressed with your game, it´s honestly exactly what I want from a "complete" Tetris game. I can tell that you love Tetris, because it shows in all the small details. Very excited to see what´s coming!