Use the cursor to control the dot. Avoid the tank thing and its bullets. Collect the apples to earn points. Every 20 seconds, the game speeds up. Simple enough. Another game like this: http://scratch.mit.edu/projects/13578815/
I made this easily playable on cell phones. Update 28/10/2013: The game now speeds up every 20 seconds. The apples also give an extra point per level. For example, Level 1, the apples give you one point each, Level 2, the apples give you two points each, and so on.