New gamemode- lifesteal

I have a gamemode idea called lifesteal***. It works like normal lifesteal but when player reaches 0 hearts, Instead of getting banned in that gamemode, they gets sent to new challenging dimension in the dark world. there, they must complete challenging tasks such as parkour, puzzle, boss fights to get back to overworld with manual hearts. Each time they go to the dark world, they return with -2 hearts and actually gets banned later. dark world should take least 4-5 hours of playing time. Also the dark world tasks will get harder each time you are sent there.

koth: there will be a 10*10 platform in a large arena where players will have to stay inside 15 minutes to capture the koth and receive prizes. This shall take place every day once or twice at a certain time.

team: player can have team,team chat,team pvp,view team scoreboard etc.

cosmetics: player tags,nickname,pets,tiers etc.

lootbox : each player gets lootbox every week( different from kits). ranked players will get depending on the rank tier.

others: custom warps, custom structures, heart recipe, playtime rewards, fun quests,[/bottle] command for everyone in the gamemode.

I can add more details to other dimension thing if this suggestion gets prioritized.