Very pretty entry, very pretty ending!! I think you nailed the theme with the minimalist visuals / audio and only 2 actions buttons.
The minimalist environments were a little rough to navigate, mainly in the opening area. All the white surfaces kind of blend together, particular in one room where you need to make a sprinting jump over a gap in a bridge, and it's very hard to tell where the gap begins, so it's easy to just run clean off. I was afraid I was going to get lost, but there seem to be multiple paths leading to each upgrade, so it was never much of an issue.
I appreciate having full air control when jumping, but it did make the character feel a little weightless. This might match with the general ethereal vibe, but it maybe wasn't the most satisfying for me. A little bit of inertia / momentum when jumping may have felt better to me. And like a few other folks have mentioned, the wall run is cool but a little too easy to abuse and just bypass platforming challenges completely.
I like the idea of the infections, but cleansing them didn't really seem to do anything? They provide a neat visual contrast, but I'm not sure what their function was besides flavor. And more than once, I would still get hit by something invisible even after destroying them, I don't know if there were still colliders hanging around that didn't get deactivated.
The ending was really pretty and surprising as I tried to use the final ability. Good job and I hope you keep working on the game!