Avoid merging with any blob

Get rid of a blob using spikes to fit into the small gap

Make a Hook shape to push 3kg box up

After making a 3 long bar making sure you aren't the middle blob, use the spikes to separate back into individual blobs.

Push the 2kg box up first after attaching to right blob

Become large

Make an L-hook shape that can push box down and fit in the hole

Make an L-hook shape to push 4kg down, then go to spike to become a 3 horizontal with you at the very left.

Push 2kg box using the 1kg box as a buffer so you don't attach

Put the left 2kg box onto the scale on the right

You can push your blobs without connecting to them by using boxes

You can be 3-long to get an alive disconnected blob to the right of the spikes, then push it one more to the right.

Don't let a wall stop you

You have to think outside the box