The fishing mechanic works as expected (while the fish is running away the "tension" grows faster).
The end of life plan doesn't cover the leaderboard, the only thing gamers can download is the HTML file but if they want to have a custom "friends-only" leaderboard they would have to implement it from scratch.
Not to mention, the "Download now" button just shows an error for now ("can't be bought", I guess the game is paid but the author hasn't set a payment method?), and doesn't download the game.
