Azimuth

Azimuth is a metroidvania game, and something of an homage to the previous greats of the genre (Super Metroid in particular). You will need to pilot your ship, explore the inside of the planet, fight enemies, overcome obstacles, and uncover the storyline piece by piece. Azimuth features a huge game world to explore, lots of little puzzles to solve, dozens of weapons and upgrades to find and use, and a wide variety of enemies and bosses to tangle with.

It is open source and available for Windows, macOS, and Linux.

Looks amazing!! Does anyone know if there is something similar for GIMP?

It looks great! Would you mind sharing the recipe?