Nomech mini, a 4×4 capacitive touch button grid

So this is a 4×4 projected capactive touch board using Atmega32u4 and back-fire LEDs for each button. I want to send the gerbers to Seeed sooon so any advice/feedback is very much appreciated.
It 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.

Nomech mini, a 4×4 capacitive touch button grid
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 KiCAD.

Everything is licensed CC-BY-SA-3.0
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Ibrar Ayyub

I am an experienced technical writer holding a Master's degree in computer science from BZU Multan, Pakistan University. With a background spanning various industries, particularly in home automation and engineering, I have honed my skills in crafting clear and concise content. Proficient in leveraging infographics and diagrams, I strive to simplify complex concepts for readers. My strength lies in thorough research and presenting information in a structured and logical format.

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