How to maximise the profit off of each dive: First, locate a guffin and hunt the fish around it (bleed them out by shooting the spine) until you're almost all out of oxygen. When you're just about to run out, pick up the guffin and keep going. This'll make it so any combo gems you get will apply to EVERYTHING you catch, since it resets if you surface.
See if you can polish it up a little. Maybe a nice colour scheme, some kind of theme for the snake instead of boxes and you could have a seriously good game on your hands. Snake is fun, and simple, and pretty much eternally awesome.
So, here's the thing. The game is polished and shiny, the graphics are nice to look at, and the menu is just wow. So... I guess they just forgot to work on the game part.
Guys. This game won't get achievements unless it has the score API in it, which it doesn't. If you think a game needs achievements, you should + somebody else's comment about that so you don't clutter it up. And as for the game, it's pretty darn awesome. The graphics style makes for great cinematics and dramatic effects, and the mix between platformer and "KILL EVERYTHING!" is great. Keep making awesome games Daniel!
 "William and Sly 2")
 "Gibbets 3")
 "Earn to Die")
 "LethalRPGDestiny 2: Conquest"){kind=icon}
 "Fisher-Diver")
 "Hanger 2"){kind=icon}
 "X Dimenson")
 "Tyrant")
 "Fishers!")
 "de Blob 2 Revolution")
 "Path of Honor: Chapter 1")
 "Homerun In Berzerk Land: Berzerk Ball")
 "Steambirds: Survival")
 "Armed with Wings 3")
 "Doodle Devil"){kind=icon}
 "Bunni: How we first met")
 "The Light Temple")
 "Undead Highway"){kind=icon}