Hello friend,
Have been using your layout for about a week now and have become fairly used to it. I've spent a little time thinking about modifications to the layout which would make it work better for gaming and for Windows users. Here's a compilation of those modifications.

BUTTON ASSIGNMENT

• Love the position of the media volume controls in your default layer, but wanted more. Never once used F14 or F15, so reassigned those to PREV, NEXT, PLAY.
• Added the Windows key back onto Layer 1 where left CTRL sits. Fair few modifiers that use that, especially for power users.

TRANS KEYS ON EDITING LAYERS
I felt that having the keys transparent in the editing layers was detrimental to my learning of the new layout. I have changed all the transparent keys here to be NO KEY to prevent accidentally typing characters while on the editing layer.

COLOUR CODING
Made some slight modifications to your colour coding for some easier clarification and learning. It bugged me that the base layer had the same colour set as the editing layer. I'm guessing the intention there was so that you always know what fingers do what, but I found it distracting so I changed the base layer to white. Have unified the Neuron colours to show which OS layer is currently active with White being OSX, and Blue being Windows. I've also tried to unify the colours depending on their function.

NEW LAYERS FOR DEFAULT QWERTY
Added in some layers to switch to default QWERTY layout so that you can more easily jump to a layout that doesn't need modification of your gaming keybinds. Stuck these on the left Move To N (numpad layer). Will likely need you to test the Layer 8 as I don't actually have a Mac to test with.

OUTSTANDING ISSUES

• Not totally sold on the placement of the square brackets. I use them very frequently as a data scientist, and they're not the most convenient (especially closing bracket ]).
• Fairly frequent misfired activation of hold modifier on space/shift/tab thumb cluster. Not sure if this is the switch types (may need clicky types for thumb cluster specifically), or if it's the hardware delay on switching layers.