I've passed every level in this pack, but some of my solutions weren't weird enough for me.
Specifically I will try to find another way to do level 8, lose 3 on level 9, and save more than 25% on level 10.
EDIT: I managed 40% (32 lems) on level 10.
EDIT2: There are so many solutions to level 9 that just b a r e l y don't work. Bleh, time for level 8.
EDIT3: It looks possible to "Take the stairs" on level 8, but it would be hard. Back to level 9.
EDIT4: I managed to lose 3 on level 9, that concludes my attempts.