What path of levels is the most optimal to take?

I'm not a pro but I feel like it doesn't make a big difference

It's up to your preference. Keep in mind that if you play from a completed file, you need to use an order that can be done from a clean file.

It might be useful to do hard levels in the beginning, like maybe lvl 10 or 30 so if you mess something up big time, you can reset and do not lose the whole run but only like 5 mins