This is so good, what the heck.
Reminds me of the board game Quarto. The simplicity of the concept and how it's replicated in the visual design is astonishing. And the sound, the soooooound. We have been thinking of implementing harmonic notes as player feedback in our games for a while now, will try to push it more next time hahaha.
The other thing I enjoyed a lot was the "negative" exploration of the mechanic by introducing the "unique" concept of the match 3. And the fact that it's still very restrictive because it forces you to match the other two aspects makes it so that it doesn't make the game easy by any means.
The only feedback I could possible give is making that bit of the rules more clear (altho the rules being interactive made the point across, so amazing work with that as well). And maybe make the border of the screen work as a clockwise indicator of how much time you have left, perhaps? As an extra visual element that's easier to parse than numbers.
Honestly, one of my favorite entries this jam so far. Looking forward to seeing this as a full release!