When you say you can use any tokens, do you mean that you can send any type of ECR20 token to the contract and exchange them for Jade/seeds? What do the hybrid seeds do? Is there generation of new tokens?

Also, I noticed a small typo on your site...

"Jade cash is used as an in-game currency, Holders of jade cash will receive bonuses all the time in the form of items, seeds, and other cool features. The game runs on etherium, but its lifeblood is Jade Cash."