There are a lot of timed events. If you go very fast, you can get one solution, but if you don't care about the bonus points you can take a different route which is slower, but a lot easier.

My best score was 4790. You might be able to get 4800 with very good timing, but I'm positive that it's not possible to get more than 4800.
It's recommended that you don't use the shift key, because you will probably get very confused when you look at the off screen machinery. Your choice, though.
This is my third level.
Also, I found a glitch in RTW. Just hold left as the level loads and watch where the camera goes!