I finished the game twice.
The game is perfectly balanced. It's not super hard to get started, and requires polished skills to beat the final boss.
Graphics - it looks awesome on my Nintendo Switch. 2D platformer is the best format for this game.
The world explorability and backtracking works very good.
Hard difficulty is not that hard. But normal difficulty is much harder than you'd expect. In a good challenging way.
A bit unusual level design - sometimes you accidentally block your way back and have to proceed to another level in order to return.
And sometimes you just get stuck because you didn't find that one breakable block in a wall. But after you get the "scanner" upgrade - finding such hidden sports stops being annoying.
Bosses are hard but become ok after you learn their patterns. I'd say that there are not enough bosses, I'd love to have more.
I've enjoyed the game a lot. And both times I finished it on "100% items" completion. It never gets boring.