STRANGE BIRD ISLAND (GooGroker)

You found it when you were moving, just behind a shelf. You don't remember ever owning it. An off-brand PICO-8 cartridge, black and coated in dust, bearing the title "STRANGE BIRD ISLAND".

Below it is a scrap of paper, ancient and grease-stained. There are notes scrawled onto the opposite side, with a red marker.

"left/right: move

up: acelerate accellerate  accelerate

square(z): shoot

cross(x): map?

collect orbs to heal and ascend

become greater

bird"

Curious, you slot the cartridge into your console. What's the worst that could happen?