Thanks for playing, and glad you enjoyed it! Yeah, the tier-upgrading-via-leaving mechanic really didn't work great (and was done really hackily via an even on a floor trigger, hence the not happening for a few steps ^_^), losing someone you just upgraded didn't feel good (even if it seemed to make sense mechanically that only fully upgraded people would get their tier increased...). Nice job getting to the end, and that's a decent high score location =).