honestly the platforming feels absolutely terrible.
as is typically the case with the feel of platforming, it's difficult to pin point why but let me give it a shot
-floaty
-ground friction too low
-acceleration annoyingly drawn out
-jump vertical/horizontal too high
if i think of anymore i'll be sure to not tell you since NG doesn't yet allow for editing of reviews or replying to author's replies to reviews. i'm sure they'll add it eventually.
in the meantime i've given you enough to chew on and i'm confident you will rectify all the things i listed promptly.
(trust me. i know platformers. i'm working on one and the feel of it is great. and i've played more than you've even heard of or will ever hear of)