This game felt super clean and polished to play, amazing job. The graphics and execution was just great, and I liked the different combinations available. Unfortunately, the bird flies so fast that it was difficult for me to tell which added more points and which were multipliers and thus I had some trouble optimizing for a super high score. Maybe some more obvious UI elements like popping text effects or a tooltip would have made it clearer.
Aside from that I think it's a fantastic game and close to 5 stars, great job!