It seems that you're using an outdated browser. Some things may not work as they should (or don't work at all).
We suggest you upgrade newer and better browser like: Chrome, Firefox, Internet Explorer or Opera

The game runs fine, most of the sound effects too (background music is also fine).
But there is one effect which doesn't work, it's the sound which the fishes make when they jump out of the water.
It sounds distorted, too loud and is very disturbing.
I just started the first easy campaign and there is fish on the first screen, waiting for some seconds makes the effect play.

Did anyone else of you had this issue?
No, not really. Perhaps you have your speakers volume set up tooo high.