I'm sorry but this is bad, gets boring too quickly to the point where you could just go on and win. I don't like the 1-up system, like those balls should be rarer. Maybe have it be like Pac-man, where getting to a certain point can give you another life. Also I suggest not using Scratch to make an actual game, as that's more of a engine that's designed to learn how to code, not actually use it to make a game.

Not bad, although I'd maybe make the extra life dots a little rarer, as it's way too easy to just rack up a million extra lives and not need to worry about hitting anything. Also, sometimes the dots get hidden behind the 'Score' and 'Lives' meters.

Also, have you considered looking at the Newgrounds API for keeping track of users' high scores?

This is just plain lazy. Feels like a project made in 5 minutes with the help of a Youtube tutorial.