I really loved it. Quite easy to get into and relaxing to play. The retro blue-green pixel graphics look very juicy.
My only gripe is with controls. The key layout is kinda unusual and non-intuitive and the keydown state is handled via repeated keyboard events that include initial key delay. There also seems to be a delay between pressing space to hit the ball and it taking effect so it's hard to be precise. Maybe transfer aiming controls entirely to the mouse.
Fix the controls, add some nature ambient sounds and you'll have an excellent old school golf game.