Wiping or overwriting with a new save? Cloud saves are never deleted, but the slots can be overwritten by syncing a new save (after starting a new game and saving at the hut). If you accidentally hit new game instead of continue, don't collect wood, just refresh the page and it'll re-download the empty slot from the cloud.
figured it out, that i had to free up magic and energy...i hate that i've learned to ignore tooltips, even though i know there's the list of the last 10 under stats
The NUMBER multiplier indicator appears to remain at its value prior to the current rebirth. currently 70dec-->125non is showing as "Your NUMBER will be 7x larger if you rebirth!"
 "Synergism"){kind=icon}
 "Ordinal Markup"){kind=icon}
 "Sort the Court!"){kind=icon}
 "Aground"){kind=icon}
 "Bloons TD 5"){kind=icon}
 "Idle Snowflakes"){kind=icon}
 "Idle Intelligence"){kind=icon}
 "NGU IDLE"){kind=icon}
Wiping or overwriting with a new save? Cloud saves are never deleted, but the slots can be overwritten by syncing a new save (after starting a new game and saving at the hut). If you accidentally hit new game instead of continue, don't collect wood, just refresh the page and it'll re-download the empty slot from the cloud.