Oh sorry I swear I added it to the credits idk where it went!
For this jam we used the godot SilentWolf plugin which has multiple backend stuff including hosting leaderboards.
If you use unity I also vouch for https://danqzq.itch.io/leaderboard-creator as it’s also a very dependable free service for hosting a quick leaderboard.
They do require a small amount of reading docs but they aren’t too hard!
Glad you enjoyed the game <3