very fun game, but a couple things about it could be improved. You could always add more levels, and i think you should also add a select level option.
sometimes (mostly on level 2) i will hit the ball and it will bounce off the slope toward the hole, but when it hits the flat ground it bounces straight back as if the flat ground was a slope too. This is annoying and doesn't make much sense.
also, i have hit the ball directly into the hole without it touching the ground numerous times. The ball just bounces out like it would in real life, but maybe you could think about changing that for the sake of rewarding the players precision? also, on one of the stages the arrow for your power gauge is behind the bar and you cant see it.