I don't even know where to start with this. The visual design is so clean yet far from bland minimalism. The character animation has just the right amount of flow to feel natural, not so much as to be cartoonish. The colours are all so cohesive and easy on the eyes.
From a gameplay standpoint, the movement of the character (as simple as it is) feels great, and gels perfectly with the stable mechanisms of the environment.
Speaking of the environment, I love how well each element is communicated without having to spell anything out. I can't tell you how many games on here have been absolutely burdened by burying you in condescending spell-outs before you're allowed to see anything for yourself.
What you've done here is perfect for what it is.