Metroid SR387 1.0 is likely a ROM hack or fan-made modification of a Metroid game, possibly based on the Metroid Fusion engine or a similar game engine. The "SR387" designation might indicate a custom-created planet or setting within the Metroid universe. The version number suggests it's a released version of the mod.  Without further information, the gameplay, history, and developer remain unknown but would likely mirror typical Metroid gameplay elements.

Metroid SR387 1.0

Metroid - Zero Mission (U)(TrashMan)