honestly I kind of prefer this one since you can get pretty OP pretty soon (like after the first few waves, I take zero damage. nit sure if cause of big defense or whatever).
AND mayor upside:
so far it seemsto be infinite duration (or at least very long).
and not jsut cut off at 10 15 or 30 minutes when you jsut got sueper lucky, got the god tier build slowly going.
and bamm, run obver, everything taken.
and you can spend 2 quadrillion coins to improve defense by measly 0.5 or so (an insult, those permanent upgrade steps)