This game kept me playing for quite a while. Great job! I had a lot of fun with it.
You're the developer, so you know what fits your game best, but I had one small idea. Since hitting the number tiles perfectly rewards you with a higher score, I think it would be cool if the special tiles worked similarly. For example, hitting a time tile perfectly could give a little extra time compared to a normal hit. I think that would make those tiles even more satisfying to interact with.
Overall, I really enjoyed it. Nice work!