Constant Updates Keep it Fresh
The developers have done a great job keeping agario relevant with the Bugs World Adventure. I specifically like the Micro World setting because it feels very high-energy. The addition of the Golden Pass provides a steady stream of rewards that keep me motivated to improve my mass management skills. Seeing an Evolution Skin grow as you consume more pellets and players is a very rewarding visual feedback loop. Avoiding viruses while being large is a stressful but fun challenge that never gets old. The current Moo Moo Season is probably one of the best themed events they have released in a long time.