My tip for this game is to use the Red Circle sometimes. When you get the smaller square especially. So the red square will do a few things:
Make your square bigger (brilliant when you are a dot !!)
Evil Squares (so that's ok, just avoid all for a few seconds)
Fast Squares (again, it's fine if you can avoid for a few seconds)
-1000 (which generally doesn't happen! I've noticed that most of the time, at least 9/10, it doesn't take the 1000 away)