Maybe the banana should be taken more literally
I like the rings, and the field like a five of diamonds card
...with a platform in the center instead, and the diamond's are towers.
Then in four places (similarly placed to the diamond's but closer to the center) are four banana shaped towers with rings on the stem.
The goal is to get the rings off the bananas onto the diamond's, or get rings from your hp and do the same. Then end up on the platform in the middle.
Now the bananas are incorporated, the diamond plate and the five are explained, and so are the rings around the diamond plate
On the other hand, maybe the human players need to run on a treadmill while the robots go. In that case, I volunteer to be human player
