I played through the whole game just to see how terrible this is, and yes, it's fucking awful.
Y'all are right, but maybe don't conclude it with "it's just Mario" because this feels like playing through a bunch of shitty
Mario Maker levels under a really crap platforming game engine.
There's this one level that stuck with me:
You drop from a hole above and onto a small block, which you do by
moving to the hole, right?
Turns out the game carries your momentum
for everything, so by moving right and fall, your character slightly moves to the right through no fault of your own. Trying to readjust your trajectory mid-air are usually useless, since turning in this game reset your speed to zero but doesn't affects momentum, so you can only readjust it by a little.
The fact that you can just buy a bunch of lives from the machine on the map renders death a non-factor, but it really shows how unfun to play that this game is.