Altered Space: A 3-D Alien Adventure, released in the USA for the Game Boy, is likely an exploration-based adventure title. Players would navigate through alien worlds, solve puzzles, and potentially face alien encounters. The description '3-D' suggests a graphical technique attempting to create depth within the 2D display of the Game Boy.  The game is expected to deliver an adventurous journey across various alien locations.

Altered Space - A 3-D Alien Adventure (USA)

Alleyway (World)