Really addictive when actively playing it. The game doesn't scale or center itself when you play it on bigger resolutions, which breaks it a little.
It took me a bit to understand what the falling things were, and it also took me a while to understand what each of the buttons did (The energy per click button is pretty obvious, but you need to understand that you can get energy passively to understand the first one).
The difference in earning and price, between passive and active earning is too wide. In my opinion, a good difference is necessary so that actively playing makes sense, but in this case its too much.
Overall, if you actively play it, its a really addictive game, once you understand it.