Very boring
There's a lot of problems with this game that make me want to play something else before long. For starters, the controls are terrible. Instead of A and S, the up arrow key could have been used to jump and the down arrow key could have been used to duck. Also, there are times where you have to jump right after ducking but the game doesn't allow you to.
Another thing that bugged me was the fact that certain obstacles weren't well designed. For example, jumping over the turtle is harder that it should be because jumping over the entire turtle is impossible. Are we expected to automatically know that the fish can walk through the turtle's head?
The thing that really made this game unbareable was the fact that you have the restart the whole level when the boss kills you. I walk into he boss battle knowing nothing about it and I don't even have enough time to adapt to the boss's fighting style or enough time to learn how to defeat it (and the information on the boss that is sometimes provided is practically useless). Every time I lose, I gotta restart the whole level!
To put it simply, the game is boring, VERY repetitive, animation/graphics could use work, the music is terrible and the controls suck.