qmk-firmware/keyboards/horrortroll/handwired_k552/keymaps/default
..
led
oled
keymap_stuff.h
keymap.c
readme.md
rgb_matrix_user.inc
rules.mk

Default layout and custom LED / OLED

Keymap is default 87 qwerty, TKL layout

It have new LED effect:

And OLED Animation: