Modify the amount of chilies as per your liking.
You can make this recipe as a dry saag wala chicken as well as thin curry. So, accordingly add water to gravy.
If you do not have tomato puree with you, then mix 2 tsp of tomato paste to 2 tablespoons of water and use. Or blanch 1 large red ripened tomato, blend it to a puree, strain and use.