On August 12, two new DLCs will be released.
The final DLC for Coloring Game 4 will be released in October.
https://store.steampowered.com/app/2108280/Coloring_Game_4__5Bit_Palette/
https://store.steampowered.com/app/2108281/Coloring_Game_4__Demake_No4/