Hah! You should be able to push or throw one crate while they are linked, to move both (E to pickup crate, Q to link, left click to throw, the line pointing in the opposite direction of the intended throw, with line length impacting throw force).
There are obviously a lot of bugs though. Thanks for giving it a go!
CombatByrd made the art! https://itch.io/profile/combatbyrd