And I don't understand the new late game balance. I had to go down at least 10 tiers of metal at my current stats, so I make nowhere near enough to level anything up.
As an alternative idea to going back to previous levels, maybe increase the likelihood of those rainbow things appearing on boss levels if someone repeats the level more than 5 times or something? Then have it go back to default after you get past the boss.
Thank you for you comment. I'll keep it in mind in the next update.