Checked the bundle and I very appreciate including Ukrainian, Kashubian, Lemko Rusyn and Polska Roma Romani (also Low German and Crimean Tatar in this specific font).
I'm not asking you for Baltic languages, but it's curious how for many languages it's only max 2 letters left for a complete implementation.
For other major minority languages in Poland it suffices to add "Ŏ" + "Ō" (Silesian), "ů" (Silesian, older orthography), ў" (Belarusian), "Ȧ" (Wymysorys, also "ao" digraph), "ť"+"ď" (older Polish-based Karaim orthography) and "θ"+"ʒ" (IRU Romani orthography).
I would be willing to pay to add such luxury.