Ultimate Slime Making

An unknown virus has appeared in the world of mucus, which has mowed down most of the inhabitants. It is necessary to begin a quick recovery of the population. To do this, just enter the game Ultimate Slime Making and start acting. Connect pairs of identical slugs so that as a result of the connection a new creature of a higher level of development appears. Below is a diagram of evolution. You have to fill all the dark silhouettes due to the connections on the playing field. The game will end when the entire chain is played and restored.