So fun, I don't think you can get past floor 16 in endless, got a 4k+ boss at floor 15, still, it's endless, so I don't mind. Fun game, looking forward to it.
You definitely can, but second magma core is a big build test, specially if you find some snakes or a lot of triple gecko fights. Actually every next magma core is an actual challenge while first two areas are pretty weak in comparison, so when you pass another magma core you can just look for new upgrades to your setup for 6 more floors:)