…this is more like a tech demo or entrance project for a developer starting to do their own Game Boy games and as such it’s a great start and I appreciate it being shared here for free for preservation.

As for the gameplay itself as it is, I can’t recommend it to anyone as it’s rather slow (pressing a button to rotate any brick will take a little delay until it’s flipped) and there’s no “press up for fast down”.

For the ultimate Tetris experience on the Game Boy, go with the Rosy hack of course. Yet this one here could mature into something pretty good (especially for a free game) with some minor tweaking. Maybe the dev comes back to it one day to make it a worthy Tetris game.