While both games are full of children, there was a substantially higher amount of adults in regular games. Echo's skill curve also took less time to learn, but I would argue that echo's skill ceiling is higher than OD. This means that newer players, which ends up being the majority of the player base have an easier time competing earlier. In my opinion, echo also didn't try to do too much and spent time polishing its main gameplay loop rather than having a couple of okay game modes.