If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Do aliens abduct cows? No! They just transport them like taxi drivers :) This game is all about flying around, picking cows up and taking them to their destinations. To make things more interesting, there are various difficulties that are awaiting for you. Rocket missiles, electro shocks, laser alarms or thieves are just a part of things that could surprise you.