you could try idea-catalog
personally, you could do themed don’t look downs, super gim bros, platformer pvp, platformer mini games, platformer hide-and seek - the possibilities are endless!
Eye of the Storm- players fight each other in a shrinking border
Themed Knockback- Make knockback maps with certain themes and allow the host to pick one
Hide and Seek- make props without collision and allow players to hide in them.
Bedwars- two teams try to reach each other’s side and ruin their bed (damageable prop)
Builder wars- two teams answer questions to get dirt, and try to build the highest!
Of course, these aren’t the only games there are, but maybe these will help.
Trigger a lifecycle device (Game Start) to a trigger, and set the trigger to lasers. Make sure the trigger has a delay, too. This way, the lasers will activate after a certain amount of time.