Congratulations, the atmosphere and production of this game are really beautiful! I hope the Homebrew Factory campaign is a success!
A question purely about Gb Studio: on the level I've screen, how is it possible to create a parallax effect in the background while keeping the bubbles in the foreground ‘fixed’? I think this is the first time I've seen this! Is there perhaps a plug-in that I don't know about?
Well done also for the references, such as Pizza Rat ^^
Hey, Thanks. Hopefully this screen cap helps. I have the level split in three parallax layers. The top and bottom are at speed 1, the thin layer (1 block high) of bg bubbles move at speed 1/2. There is also a void 4 blocks high between the foreground (bottom layer) and the small background bubbles (middle layer). It's technically part of the foreground. I move the camera down 4 blocks at the start of the level, and lock the camera to the player on the H axis. This allows the player to jump past the hight of the screen. You'll also note when you do this you have to adjust where your collisions are placed. 
