This look really nice!

I contributed a lot of macOS related code to mpv, but even if the project has a huge user base of power users, developers, videophiles, it's quite hard to use by your average joe. This project fills that gap very well, and I finally have something to recommend over VLC.

Excellent start! I especially like the audio features. Movist is my current reference app for movie playback. But IINA is now in the on-deck circle. Best of luck.

"modern" is misspelled "mordern" in at least two places.