Enjoyed the game. Had a little hit of excitement every time I sunk a shot. Good job.
One issue I saw was that there seemed little need for a low powered shot. It was almost always a blue banked shot. Nothing wrong with that but if that's the case you could simplify the game and drop the ball power setting, make it all about angles.
Or you could add in a couple of levels that use the lighter power shots. For instance the jump in shot difficulty from hole 1 to hole 2 is quite large IMO. You go from up hill shot to water hazard plus spinning hazard. One skill is hard enough to learn per level.
On hole 2 if you dropped the water hazard and made the hill a little less steep, or even a downward slope toward to hole, then the player would have to shoot under the spinning hazard with a lower power shot. Or face the hazard throwing the ball past the hole.
Like I said it's a good game. I think the art style (line) drawings work really well. Hope to see what you do with this.