I really liked this game - it was a lot of fun. I was kind of getting dumb ways to die vibes but with a countdown! Super cool game, the music and art is great as well, you should be super happy with what you've built. The only improvement I could suggest would be a leaderboard!
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There's definitely a few options (for Unity). I think the most popular are PlayFab, UGS (Unity Game Service). I think this video is a good place to start. Having said that I haven't implemented a leaderboard before and I prefer Godot. If you need help implementing one after the jam let me know, I'd be happy to help :)