There are both more stages (as noted I've passed the previous cap of 2000), and if you get the right upgrades from the gacha, heroes can be leveled higher. Unfortunately there is no real way to ensure the heroes you get upgrades for in the gacha are relevant, and as I noted before you can get moefitactes from it which while possibly nice early on if you get a good one you lacked, is rather bad when you've got all of them to a decent level. If you could purchase upgrades for specific heroes using either the crystals from fairy chests/paying, or (preferably) moe crystals from resets (even if it was more costly), it would be fine. Unfortunately, that is not the case at present. Hopefully a later update with adjust things in a more reasonable direction.