The event has ended. Servers will remain operational until April 23, 15:30 UTC, so the game will remain playable during that period - however, the leaderboard will no longer update. After server shutdown, the project's source code will be released on https://github.com/zzazzdzz/fools2018.
Play online in your modern HTML5 compatible browser without any further setup, or use a desktop app with the BGB emulator. Click here to view your achievement page (unlike the leaderboard, this will still update to match your game progress).
Note - if you're constantly getting communication errors when using the online client, try logging out and logging in again.