I like this one! The visuals are super nice (love the limited palette), and while the audio was a little repetitive, it did a good job of indicating what was going on. Maybe consider adding some pitch shift at random each time a sound plays to freshen it up for the player.
There's obviously a lot more you can do with the actual gameplay too, but the one thing I thought it was missing was some visual indication of progression - even just a number for what 'round' you're up to would be great!
Really good job.