I got through to the end, I think? Once I got to the doors in the room with the ramp it went back to the title screen.
It's a good idea which uses the theme well. Picking up and moving the crates was very glitchy for me. Sometimes they would move very far away, but still act as if they were being held. I also found I could cheat by getting to the next checkpoint with the smaller bot and then loading from there.
I also managed to get stuck at the beginning of the game, by going into the charging station before beginning the story sequence.