This is really cool, fun, and astatic. It is tough to see your UI elements tho, you need more contrast. In the case that you keep everything green, you need to make the darks MUCH darker and make sure there is a value contrast between the different elements.
Also, I'd make the combo click hit box more forgiving seeing as this is and idle game, no need to be frustrating in my opinion.
Great vibes, well done.