It's fun, but the grading is too harsh for the lack of precision of the tools. The brush works great, but the razor and the cream work erratically. It's difficult to cut a small bit of hair around the ear when it shouldn't be, not with a razor. Maybe a zoom option or a high-contrast view for seeing details would help.
Giving the punk guy a hogan was waaay harder than it should have been. If it was a tricky style then you would expect it to be hard. But cutting a straight line with a straight razor should be straightforward.
But it was a fun concept and everything else was spot-on. Bring on the sequel!