Frag-tastic
I think this is one of the best games of its kind. It's well balanced (step-by-step increasing difficulty) and has fitting achievements - which could have been a few more ;)
Though the physics (which are great) are most important, graphics are very satisfying and the animation is smooth while nothing distracts the gameplay. Sounds are everything but annoying and play their part in this as it should be.
Of course there are many possibilites that weren't used - such as additional animations, targets and backgrounds (or completely different 'worlds'), but on the other hand the important fact is: Fragger lets you reach the goal through simplicity coupled with a lot of fun.