Note that while the MSX release is available now, the Windows release is scheduled for 27 May 2021
Source: https://locomalito.com/

Solve the mystery that hides in the depths of the ocean […]
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Solve the mystery that hides in the depths of the ocean

Plot
There are things that nobody had seen before in the depths of the sea. They emerge from the abyss to conquer everything. Play as Marcelo the diver to solve what looks like an industrial sabotage or play as Marila the mermaid to save your town from an unknown menace.

Details
A game by: Locomalito
Music & sound: Gryzor87
Promo art: Jacobo García

Release date: May 13th, 2021
Genre: Multidirectional shmup
Development time: 4 months
Creative Commons License

About
Mutants from the Deep is a submarine shooting game that mimic the technical limitations of the MSX1 computers. Choose your character, enhance your gear and fire your weapons in 8 directions as you swim into the dangers of the deep.

Features
Look and feel of a MSX1 game from 1987.
2 characters, 2 stories and 1 special ending.
7 levels with different scroll directions.
A single health bar for the entire game.
Stores to upgrade your gear.
Around 25 minutes of game length (once fully mastered).

Influences
Konami games for the MSX, sea life, mythology and 60-70s secret agent vs villain stuff.

Stories
The project was finished in 2018, but before releasing it, Gryzor87 said "Hey, I know some guys in the retro scene who could actually port it to the real MSX". Manuel Pazos and Fernando García jumped in, did their (amazing) magic and turned a MSX-looking PC game into an actual MSX game. And they put it in a 64k cartridge!

Download/Info: https://locomalito.com/mutants_from_the_deep.php