Hey a GBStudio game with SFX, what's your process? It would be awesome if one day GBS could bundle a solution. I've set up a .vgm pipeline for myself, though I opted to use Godot for my game this time (also a space shmup, of less ambitious scale) and cheated by using duty 1 sweeps for both kick drum and pewpew SFX.
TwoSpaces's instrument design and chiptune composition is excellent. I particularly like the boss music. The BGM reinforces the sense of scale and epic adventure, and so does the pixel art.
Gameplay ramps up the difficulty gradually. Save file inclusion is nice. I'm at the 3rd stage, trying out stuff from the shop. I assume bubble shield isn't a passive upgrade? Not sure how to use it though.
Nice game.