Nomech mini, a 4×4 capacitive touch button grid

So this is a 4×4 projected capacitive touch board using Atmega32u4 and back-fire LEDs for each button. I want to send the gerberas to Seeed sooon so any advice/feedback is very much appreciated.
Nomech mini, a 4×4 capacitive touch button gridIt fits Sob 100x80mm but the top acrylic will sit right on top of the PCB as the dielectric properties of whatever is touching the electrodes matters a lot.
If this works well then I might scale it up to 8×8. I want it to work as a cheap monome replacement without using mechanical buttons; hence the name “nomech”.
This is designed using Ki CAD.

Everything is licensed CC-BY-SA-3.0

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