What platform are you playing on? I've had some minor bug reports, but nothing that qualifies as super broken.
Browser, Chrome, PC. All but the first level had the units spawn with random AI and stats, I'd see small green circles around units other than the healing flower, full-sized green circles around the not flower units, flowers with no green circle at all, hands shooting thunderbolts, stuff like that. Those were the most visible and easy to explain, but I'm pretty sure there were more that were less visible because after the first level balance felt completely off. Things like units would randomly survive way less time than the last wave despite having the exact same deploy order and upgraded health