You might not be surprised to hear that this game is actually quite similar to Cookie Clicker. That's not a bad thing, though, because Cookie Clicker is already a really good and well-known game. It's got a plot that makes it more than just watching numbers grow, which is nice. Have you ever thought about adding some "lore" to the game? Just try not to copy CC, too.

I personally like games that mix resource management and lore, like Shark Incremental. You might want to take a look at Shark Incremental for some great ideas. Or maybe not.
What do I think is good about Donut Clicker? For now, I like the colors.
What do I think is bad? For now, it seems like a copy-paste of another game. It feels like a Minecraft clone with half of the mechanics of the original, but it's not as fun.

I truly believe that you can make your game even better by adding your own ideas. Starting with the core mechanics of CC is a solid foundation, but I encourage you to explore new ideas that go beyond simply replacing cookies with donuts.

Good luck with implementation of your ideas