Altered Beast is a game that looks like it could have been found in an arcade playing machine. In each level, the player must beat collect 3 powerups in order to transform into a powerful beast and fight the boss of that level. This game was one of the first games of the Sega Genesis system.
This might look like it's an auto-scrolling game, but in fact the scroll speed depends on if there are any enemies on screen. The player tries to kill all enemies as soon as possible to increase the scroll speed.