I liked the aesthetics of the game, but I think making the tadpoles a little more evident would be good. I almost missed them because they are so small! (Some didn't have the glow around to indicate I was near them)
I also faced the bug that gooby mentioned, after sleeping I had unlimited energy for the rest of the game.
But I liked the game, played it a couple of times untill I was able to find all tadpoles!