I'm so glad this finally released. This is a piece of art since it's physically super close to the "original" from PC while aesthetically being a pure and well designed Game Boy game.
Also the fact that it runs on GB, GBC and the Super Game Boy is pretty neat, especially since it allows for a true "console-like" multiplayer experience on a Super Game Boy, allowing both blobs to be controlled with two SNES gamepads. Only very few games had this feature back then (Street Fighter II comes to mind). It also features link cable multiplayer which I've already tested with a friend. Such a fun game.
By the way if you can beat RED or at least score a few points against him, you're pretty deep into the physics of the game and might wanna join the official Blobby Volley Discord server: