I can have infinite lives in night levels - as in, it treats it as if I've run out, but the counter doesn't change from five and I can click on another level without issue (losing reacts as if I had one life, but the counter doesn't change and I can repeat it) - but it also doesn't register a level being won. The sugar crush thing plays, but then the level lost thing pops up. I can fail at the same level, infinitely. Haven't tested on day levels because I'm waiting for the next area to unlock, which makes inevitable failure even more annoying.
Also the 'accept conditions' button on the account creation screen is kind of pushed off to the side so it's rather hard to see, which made this process even more annoying than it should have been. And your automated email responded to my original email two extra times for no reason.
So those might want to be things you check out.
Apologies for typos; mobile.