Altered Beast: Guardian of the Realms GBA

Zeus, creator and ruler of the Guardians of the Gates, raises you from your grave! You must go fourth and defeat a new, unknown evil that has destroyed the Guardians and ravaged the universe. To do so, you must collect the keys and Essence of each land, transforming you into beasts with unnatural powers and special abilities. Conquer this evil and you will become the sole Guardian, the protector of the universe.

Game features include Orbs of Essence that transforms you from a man into 13 unique wild beast creatures like Dragon and Scorpion, 16 worlds inspired by Greek mythology, combat with ranged, melee, and magical weapons, and power-ups like Shockwave and Venom for special attacks.