I discovered a bug that would prevent players from taking damage when losing.
I have also added the spawning of a firework when the player wins.
This update is STRONGLY recommended!
If you discover any other issues with the plugin, please do send me a message or leave a post on the forum with your issue and I'll try my best to assist you.
Change-log:
Update GitHub repository
Fixed setInvulnerable true check
Added summoning of a firework on player win