This game is just too fiddly, especially with the time limit. I get that it relates to the theme, but I didn't see any part of the game that benefited for a time limit. Besides the spike collider mentioned in another comment, I think needing to hold jump on the trampoline to make just is unintuitive in this kind of game, especially given that the difference in height isn't even that much. But I think the biggest issue is the need to get good positioning while throwing objects, which basically ensures that at least of the time positioning won't work out. It wouldn't be nearly as bad if the most recent actions could be redone, but most mistakes in this game require starting from scratch.
The point where I stopped was in the level with the key on a conveyor belt pointed toward a red block. I felt like I'd had enough when I found out the time frozen key could still be pushed into the wrong spot by the trampoline.