The physics system feels really, really good. The inability to control the speed of your shot is not fun with these levels (actually, I just reread the description and I think I'm a dummy that didn't do it properly). The hole detection is frustrating. Determining the correct letter seems like a pointless step, just change it to one regular hole with other obstacles (although it does make for a great title).
I can't stress enough how good it feels to knock the ball around and hit walls and boosts. It's such a strong foundation for a killer golf game. I just read a comment that the dev is working on another, similar game. I'm very excited to play it!