Its decent.
I love the basic aesthetic, the game overall feels very smooth, but I while playing I felt like the hitbox of the player was a tad too large, leading me to die in places where I felt I shouldn't have.
Also this is a nitpick from personal preference, but I feel like I should have more control over the jump height in a platformer, tapping jump ends up giving me around the same height as holding in this game and I'm not too fond of that, but again, thats just preference.
Overally a pretty neat game, not bad, but very basic.