Just a heads up, S.5 will be getting an update that will hopefully reduce the possibility space a decent amount (I believe one of the fusions you've found will be blocked as well, but the solution shouldn't change much). My suggestion would be to focus on making the square sticky block first. As you've seen, you can only get on the upper platforms once (at least without using a bunch of pieces building a bridge) so try to get as much done as you can before dropping back down. I know this is still very vague, so feel free to reply with any further questions you have.