What are some games that feature really unique level/skill progression systems?

>>713332445 (OP)
Donkey Kong Bananza

>>713332445 (OP)
Bioshock games. You kill children by ripping a parasite out of them to extract its delicious progression goo

in deus ex 1, every time you get a new cybernetic ability, you have to pick between two exclusive choices. it's pretty simple, but it's odd how most games let you fill out the entire skilltree

>>713332708
that's just fluff