This is really nice, Miles. Very current and versatile. It strikes me as a follower of Unger's sanses (though less modulated) and that's a good thing.
- On your 'Kk' the thin connection of the diagonals to the vertical is a little awkward. I feel it should be heavier or not touch at all.
- I think the 'y' tail is a little too long.
- 'r' is excellent
- The char set showing is missing an 'H'
- A few of your mathematical symbols are too heavy (≤≥±)