My objection to the ending is
first off, nothing they did matters - it’s like the episode where Number 5 reset the day at the end. All of the character development that occurred was wiped out. Sure, we remember it all but they don’t… like for instance, the dance between Lucas and Allison - that was a sweet, touching moment… that didn’t happen because Number 5 reset that day. So any sort of reconciliation between them is gone. I think that’s a cheesy way to get issues resolved.
secondly, what’s the cost if you can always go back in time and try again? Fail the second time? Go back in time! I can possibly forgive this because all of the kids are going back in time, so things that happen between the kids won’t be forgotten So there’s a chance they can still advance the story even if they fail. But it still feels like an easy out.
Oh there’s definitely going to be a second season for this.