Could be better...
OK, I know turtles are slow. OK, I know they aren't the most exciting species on this planet, but I think you could spruce this game up a bit...
GOOD POINTS:
The game is easy enough to play. You click on FEED, SLEEP, TOY or TO/FROM WATER and the turtle does that.
BAD POINTS:
There doesn't appear to be any objective to this game. I tried just feeding it, and it went from excited to kinda happy, then a quick go on the toy brought it back up again... I hate to say it, but I tried to keep the turtle awake and see it explode, but I didn't manage, coz all I had to do was send it to sleep once and it was fine...
You have the basis of a game here, but as it is, there is no point as you say in your description...
Work on it and resubmit!