To keep it simple theres 5 types of bunny you can get and it's random. The bunny design is the same as the starter profiles you Sleepy, Sunny, Churro, Dollop & Twinkle.
The goal of the game is simply combine 2 of the same type of bunny to upgrade and then earn cake rewards. So for example combining 2x level 1 Sleepy = Level 2 Sleepy and combining 2x level 2 Sleepy = level 3.
Farming At the end of the day the rewards pool will distribute all level 2+ bunny
So for example if level 2 gets $1 as a reward then level 3 should get $2.5.
Figures can be changed for balancing, they are just examples