Sorry you couldn't catch any tuna! Yeah, I wanted to add key remapping, but ran out of time on that one (might add after jam voting concludes). The technique for going fast is to press O->K->R->A in quick succession, in that order. Each body movement gets a boost of speed if the one before it (from head to tail) was recently pressed. So Head->Back->Tail->Tailfin is the key. It's kind of a design cop-out for me to say, "yeah, unintuitive controls are by design," but that's the hole I dug myself. Glad you liked the art at least! Thanks for your comment and thanks for playing! I look forward to trying out your game tomorrow! :)
If you felt like trying it again, if you press Backspace 16 times or so, you can unlock endless mode, which doesn't require the catching of tuna. Still requires air though!