No wonder your games aren't good if you don't take any time to design and make your game.
How does it work? What's the gameplay? What are the mechanics? Why is it fun?
Good games aren't made in a day. (well, they are, but they're well thought out, short and not rushed)
You won't get experience in making good games if you make a lot of bad games.
The games you made so far, do you consider any of them a good game?
Or rather, what do you learn from all of this? What did you learn from each game you made so far?
The scripting is at it's basic, you are pretty much skilled at making quick "concepts" of simple games. It's not like you will learn much from doing such scripting over and over again. (simple platforming, simple movement, simple bullet shooting, etc)
You won't learn much about art either, as you don't spent much time on it and just produce quick placeholder art.
The game mechanics aren't anything new or exciting either. You won't learn much about different genres if you spent very little time thinking about them. "Hmm, today ima make a shmup. I make a movable ship that shoots bullets, an enemy that moves up and down, and score. Done! Let's move on."
I'm just saying. I don't want to discourage you or anything, but I just think it would be best to actually spent some time making a game and thinking about how to make a game and not just hurl them out like crazy, thinking making many bad games will make you better at making games.
Join Ludum Dare. Do a game a month event. Think about what kind of game you want to make. Think about how you will make it.
Kudos for setting out to do something like this and kudos if you will actually stick to making 66 games in just two months. But damn man, I dunno if its worth it.
Good luck!