This is a remake made by fans for the popular Metroid 2 with everything being redone in a sprite form similar to GBA games.
Metroid II Return of Samus Remake is an action-adventure video game developed and published by Nintendo for the Game Boy handheld game console. The second installment and the first handheld title in the Metroid series, it was released in North America in November 1991, and in Japan and Europe the following year. The story of Metroid II follows the protagonist and playable character Samus Aran, who is sent on a mission to exterminate the Metroid creatures from their home planet SR388 before the antagonistic Space Pirates obtain and use them. The gameplay of Metroid II involves killing a fixed number of Metroids before the player can advance deeper through the planet’s tunnels.
Here´s gameplay video by GameXplain