This is a bit more complex than the simple Agar.io, so if you are looking for something challenging, definitely check it out. Other than that, you can jump, eat, fly and also attack the enemies.
However, there is another opponent called AI drones which drop cherry bombs frequently so try your best to save yourself.
You can eat pies on your way and regenerate energy to fight off opponents. Pie.ai is another game like Agar.io which is about survival and gaining a larger size in the arena. Do not miss this game if you love agar.io. You can also divide your cell into smaller pieces by pressing the space key for better navigation. There are also many options: press W key for ejecting some of your mass which helps in dispelling other cells. You can eat cells which are smaller than you and increase your size.
However, mechanics is where the game takes a lead with faster movement and several other features. Gota.io is very similar to Agar.io in terms of both theme and gameplay.