Intrigued. Is there a secret in every level? In some level I find it purely randomly, squishing my eyes as crazy but cannot find clear pattern for it. Its great little idea. The high pitch sounds is sometimes painful. 

Finished the game! love golf games, I'd like to make my own one of these days. 

The audio when scoring / getting the ball in the hole was quite loud though and I couldn't get the power I wanted on the ball sometimes because the mouse went out of the game window and stopped registering my mouse input.

I didn't encounter any secrets personally, but according to the other commenters there might be some? still a solid game, good job!

Dear Parts & Bolts? Where did my ball go?

Very subtle, but a cool idea. If you're reading this and you think it's a just a golf game... 

This was great! I didn't figure out that there was something else going on until after my first playthrough. Really creative!

Not bad, hitting the ball needed getting used too but it's a classic.