thank you guys!
did some more mockups
trying to figure out how the character will react to the enviroment
here are 4 hypotetical moves: small step, slightly higher step, little climb, and wall climb (4+ tiles high)

here i encountered some problems:
1) with such small hitbox some elements (sword) may cut through the tiles
solution 1: enlarge hitbox - don't like it
solution 2: deal with the problem in level design, avoid 1 tile wide walls
solution 3: who cares, minor glitch
2) platform too small to stand on, unpredictable behavior (and looks awkward)
solution: again, deal with the problem in level design, avoid 1 tile wide platforms (during knight sections) ?
3) common problem in platforms
solution 1: make him fall down after half body is over the edge - rough
solution 2: do a "step/jump down" animation, when you approach the end of a platform - better
now the tile size is 10X10, instead of the usual 16X16
will it cause problems? is too small, considering character size?
ah decisions, decisions...
