Space Invaders Odyssey is a game made by Overclocked to show Clover Entertaiment how Space Invaders is done.
Gameplay remains largely unchanged from the original. Players shoot the invaders from the top of the screen and can hide behind barriers. Something new that was added was that players can recieve upgrades after defeating numbers of aliens, such as Double which will duplicate the ship.
It also features several worlds and many different type of invaders.