Chara-Ani has done an April Fool’s page for the Evolution games in the past, but it’s been nothing like this.
In fact, they’re currently running a kiriban contest on twitter. If you get one of the numbers on the list, screenshot it and tweet it at the official account.
I have also made an archive of the site so that once it’s gone, you can still experience the beauty that is their April Fool’s re-launch. It’s too good to not archive.