This is a really fun concept! I loved the music and the art style, and the way the faces are generated is clever, with there being certain templates that are slightly rearranged so you can't ever just memorize a face type. Maybe this was a failing on my part, but I couldn't get more than 2 sketches each round. Maybe it's my perfectionist brain and lack of pixel art skill, but I think being able to change the speed of the brush OR increasing the time limit would help a lot to make people feel like they have a little more control over how many sketches they can complete. As is, I didn't really feel like I was getting any better after the first two tries.
Great idea for both the theme and the jam limitations, great work!