Hello,
I have run through Endless 2 twice and both times I died after Wave 60 but did not receive the rewards (first time Wave ~90ish, second time ~115). I was Not playing New Game plus yet. I did not have an option to leave battle (the button below the Wave # that I noticed in Endless 1). I have started a New Game Plus so I do not know if I can go back anymore.
Thank you