I'm on a Mac. On Firefox, buttons grow invisible for some reason, but it's still playable once I figured out this fact. Possibly related to this error?
[14:38:41.686] IndexSizeError: Index or size is negative or greater than the allowed amount @ http://www.flog-game.com/game.min.js:51
Even balls went invisible at times... Gets frustrating, but I endured a few levels.
On Safari it never finished loading, so I checked the error console:
Failed to load resource: media/sounds/button.*
Failed to load resource: media/sounds/arrowBoost.*
Failed to load resource: media/sounds/smallBounce.*
Failed to load resource: media/sounds/bigBounce.*
Failed to load resource: media/sounds/mediumBounce.*
At any rate, this is super entertaining, and I like the twist on minigolf you have here. Good job!
edit: Forgot to mention; aesthetically brings me back to Kirby's Golf Course and the like, cool stuff!