Thank you for the great feedback!
We wanted to implement more mechanics to the timeline but unfortunately there was not enough time. But the idea to cut clips to have them stop and start at a certain time is great, thank you!
You got the right idea with the pool. It is actually designed so that you can't beat the level in just 1 take but the pool stays filled once you did that part. It's not very obvious, so for sure we need some tweaking on that one.