Great concept and pretty fun! Only complaint is it would be nice to know my score, but I suppose golf, like life, is more about the journey.
Yeah honestly it wouldn't have been too hard to add a counter, though then again I'd need a results screen. Had a few things planned for "If I have time" (I didn't): scoring, turn timer, mercy rule if you take too many shots, player running to ball after hitting (though with how the player obscures everything I definitely couldn't just have them sticking around after their turn, so this'd prolly get cut), better outline for the course, generally improving art, power alters speed of animation, and last but most fun: inter-ball collision
My main regret was not taking just a bit longer to add just a couple more levels to take it up to like a 5 minute playtime. Easy to add em, just hard to make em interesting, but it could use even bland levels just as an excuse since 3 levels go by so fast you don't have time to improve much at the controls in one playthrough. If I were to turn it into a full game though (Low chance of this, but I am slightly tempted), I'd definitely have to lean more on creating gimmick terrain to give it lasting interest.