Mutant frogs are the aliens that the player will see. They appear on the first level of the game. They appear to be quite small, having very weak attacks and health, but they are quite fast.
These creatures appear in the level 3. They appear to be human shaped. Their attacks are quite strong, while they have moderate health, but they are very slow. As you go on, from 6th level the bipeds would start carrying weapons and armor. Different bipeds would shot plasma and rockets.
These aliens are the most reflectively of all, meaning they appear quite a lot from level 5. They are the fastest aliens, moderate attacks, but quite low health than the others. Green colored spiders are melee attacker, as the others spit green glowing fluid that is quite deadly to the player.
Rhinos appearance starts from 7th level of the game, with armor on. These aliens are the strongest of all, having the strongest attack, and health, but quite slow speed. Green rhinos shoot plasma, yellow shot plasma and lasers, red shot lasers and blue missiles, as the blue one only has no armor, but it shot lasers, blue missiles and it drops the magma cannon.
All species are colored differently. There are four different colors:
Green color resembles that the alien has very weak attacks, slow speed and low health, meaning that the green colored aliens are the weakest.
Yellow color resembles that the alien has a normal attack, speed and health.
Red color shows that the alien is quite strong, fast and has more health then an average.
Blue color is the rarest color. Only one specie of the aliens get blue. Giving one of each powers of the strongest attacks, fastest speed and extremely high health