Free app to learn Croatian

Hey all, my brother and I made a language learning app that includes Croatian. Hoping to get some feedback.

We are working on expanding lessons, games etc.

We're over at r/polychat

iOS: https://apps.apple.com/us/app/polychat-language-learning/id6449936635
Android: https://play.google.com/store/apps/details?id=ventures.appliedai.polychat&hl=en_US
Website with some games: https://www.polychatapp.com/