Crystal Caves

Crystal Caves is a side-scrolling platform game, where the objective is to finish all 16 levels, collecting every single crystal within. Numerous monsters, robots, mine carts, poisonous mushrooms, and other hazards threaten you along the way. If Mylo is harmed enough times, he dies (but thankfully he has unlimited lives). To defend himself, Mylo has a missile pistol. (mobygames.com)