This is a cute little shoot-'em-up I made in SEUCK when I was a child, along with Revenge of the Mutant Toasters. It's about as non-violent as I could make it, given the framework. Hunt the treasure and avoid the dead ends in the maze-like underwater caverns!
To play it, fire up a C64 emulator, "insert" blobby.d64 as a disk image, and type in LOAD "*",8,1.