Thanks, Conway. If it wouldn't be much trouble, could you PM me your solutions to Level 1 and Level 6 (and if you have found what you think may be backroutes in any other level)?
I'm home for winter break now
so I've made minor terrain revisions to a few levels, though they shouldn't really affect solutions. Also I have come up with 4 more levels and removed 2 levels that I didn't like too much, and level 5 was moved to level 3.
If you've already played my first pack, the new levels are 2, 5, 9, 10.
(Edit: Link removed, it's in a more recent post)