I like it
I like it a lot!! I love these types of games, the only problem I have with it, is when you finish a stage you should be able to have the option to hit "Play next stage" or something like that. I don't like going straight into the next stage because what if I look away or have to go do something. And the other thing is that there is no "Pause" button.
Other than that I like it, and I wouldn't even mind if there was an element of upgrades in between the levels.