This was a cool idea! I wasn’t able to complete it though (but I am bad at these types of games!), think I got to level 4 or 5 (didn’t think to count them when it was going well :D) but then I reached one I can’t work out. The end looked a bit like this:
XXX
XXX X O X X XXXXXX
I got the crate to the O but then couldn’t work out how to get behind it to push it, was I on the right track with it?
The only feedback I would have is that it help if it was more obvious how to get the crates out of the elevator initially.