There is just one tiny little request I would have - to add a letters ć (Ć) & đ (Đ). They have the same forms as "c" and "d".
urednik - I am quite literally speechless - why on earth didn't you include these with your original request? The font has shipped. Volunteers, who are strangers to you, worked quickly and hard to meet your original request and now you want more custom work?

Koffee TG was released as an SIL Open Source Font, you and anyone else is free to add to it, and use it, and release your version (with a new name) on your own.