The game Cellings allows you to download other species from Steam Workshop and you can also upload your own. If you would like to find a Steam Workshop in Cellings, just follow the steps in the image below. It's not that hard. Or is it?

In the game, you can collect Valuable Materials which are the bouncing balls that can be found in looting objects or you can receive them from making a new friendships or the opposite - beating your opponents. The Valuable Material can be used to fulfill the other species requirements or you can get rid of it in the 'Kraken-looking' hole, officially named as 'Sacrifice Hole'. In such case, you will receive a plenty of free material!

As can be seen on the image: Take the Valuable Material > throw it to the Sacrifice Hole > bam! Receive materials!

If you move in the middle of the portal, the more information appears. In short: It's an Arena entry to the Dimensions - Dimensions allow you to fight in 3rd person against other species. In the initial Cellings version, there was a fractal object generated in real-time. We had to remove it due to many low-end computers couldn't take it.