I'm already working on My Lunar Farm. Here's the description:
 
My Lunar Farm is a breeding simulation game! At the beginning, all you own is an empty field, a little money and a single whale... You need to feed the whale, take care of it and improve its lifestyle, maybe. Well-fed with stolen Earth meat, it will lay eggs (somehow) which can then be sold at the market. With this money, you can buy equipment to hunt for animals in the wild. Little by little as your farm builds up, you will unlock certain bonuses: an airship, Nutrient Spray™, a portrait of the King, etc. And you will be able to exchange your animals with your friends who play My Farm, My Exotic Farm, or My Asian Farm! But not My Australia Farm. Fuck Australia and its farms.
 
Our farms are...different.

Your Farm
Giant Farm (You farm Jeff's, Vinny's, and you plant Ryan's. Brad is a tractor)

The "My *insert adjective* Farm series... the epitome of lazy game descriptions. We all know about My Farm and My Exotic Farm, ... and apparently there's My Asian Farm that was unbeknownst to me, but now we have My Australian Farm!

My Australian Farm is a breeding simulation game! At the beginning, all you own is an empty field, a little money and a single emu... You need to feed the emu, take care of it and improve its lifestyle. Well-fed with seed, it will lay eggs which can then be sold to the Shopkeeper. With this money, you can buy new animals at the Farmers' Market. Little by little as your farm builds up, you will unlock certain bonuses: a grain store, a wind turbine, a sacred stone, etc. And you will be able to exchange your animals with your friends who play My Farm,My Exotic Farm, My Asian Farm or My Australian Farm!

So that got me thinking. What if I made my own farm? You can do it, too. It's very simple and Mad-Libbish. All you need is an imagination and time. Feel free to use the above quote as a template.

So... feel free to go at it. We may have ourselves a future hit on our hands.