Vacant Ark is a dark and atmospheric indie
Bullet Hell Shoot 'em Up developed by
Buster, available as the third game
here
. It takes a bit of inspiration from the
R-Type series but is quite novel in itself. Ammunition is required for any attack besides a weak close-range attack, but you can get this ammunition by blocking enemy bullets with something akin to
R-Type's force device.
An oceanic planet is discovered. Scientists on Earth create a cyborg mermaid and have a little girl remotely pilot it, in order to explore the planet. It turns out that a good deal of the life in the ocean is hostile.
Vacant Ark contains examples of the following:
"Return to Earth. You are not invited to here..."