Huge Improvement!
This version is alot better then the first one. I especially liked the homing red sphere. That was a nice touch, but there are a few things that can make this better...
You could do the same thing you did with the first version and have the blocks change color during each transition into the next difficulty. Also, you should have different music as well for each difficulty. And the two most important things: Make it a bit longer, and have a timer or a timed difficulty...