Survival of the Fittest allows players to pick between three different playable characters: a bear, a cat and a dinosaur. Each have a specific strength: the dinosaur has the highest strength, the cat has the highest speed and the bear has the best defensive capabilities. Each character has its own pool of skills, and players get the opportunity to customize their fighter to their own personal play style through leveling up.

The majority of players'time in Survival of the Fittest will be spent in battle. Prior to beginning combat, players are able to pick between several available opponents to challenge. Battling players who are online at the same time offers higher rewards, but battling AI-controlled offline combatants is usually easier.

Survival of the Fittest is kept accessible but challenging, if a little light on content right now — some more playable characters would be very welcome, for example. The game's still in its early days, however, and there is plenty of time for Izelis to provide updates to the experience.