Aliex was one of a series of games released to support the Trojan Phazer light-gun add-on.
From the back of the box:
Stranded on another world after a forced landing, you have waited for help to arrive. Instead of help all you got were mutant troops and their killing machines, chasing you through the searing heat of the desert, and hunting you in the murky swamp land of this evil world.
All you salvaged from your stricken craft was you hand held phazer, can you survive alone on this hostile world and blast your way to freedom?