Good session time but low retention?

Has anyone experienced having a game that has good/decent session time but low retention? Well my game doesn’t have great session time or anything, but its enough for the brainrot genre(my game’s genre) my issue is just that the retention is like 3% on average. Does anyone have any experience on this and know why something like this could be happening? 50% of my players stay past the 5 min mark so a decent amount of players are really engaging with the game.

Link: Roll For Brainrots! | Play on Roblox

Can anyone help me out with my game’s design to fix this issue?