Fun game. It is simple but still fun.
Pros:
-Great job on making the ladders generate randomly, helps keep it from getting repetitive whenever you have to start over.
-I like the little blue ball guys that fall down, they seem to generate in a pretty balanced way
Cons:
-Would have liked a life system, maybe allow two or three hits before you die
-I played until I died a few times and once or twice I died and had to refresh the page because when the game prompted me to hit ENTER to restart I would press, for example, the left arrow once and the sprite would jump right continuously until he jumped off the far ladder, might be something to look into
Other than that, I liked it. A life system or some kind of pick up system would have put it over the top into a 4.5 or 5 star rating though. Good work.