Ah, this is good to see. Instead of an indie releasing an actual Metroid tribute game, using the same characters, Finnish developer Arvi "Hempuli" Teikari has seemingly used Nintendo's series as inspiration for his own game about space exploration, monsters and jumping.

Environmental Station Alpha, and with its lo-fi visuals and wonderful soundtrack, is still in development, but you can keep up with it at the link below.

Hempuli's blog [Site, via Pixel Prospector]