ooh yes (consider a border for contrast too) but also no subtitle/caption button, consider hiding buttons for unreleased features, consider a PiP button, and move the progress off the edge if you can (like how twitter/youtube do it)
but like... pretty cool 👀
ah yeah we'll have captions. PiP is a bit out of scope. and I'll move the progress up once scrubbing is implemented (otherwise people will try and click on it and be disappointed)