Simple, straight to the point, solid, and without any other complicated problem, and awesome.
Its addictive, have a wide variation of weapons in the shop, good design of the enemy and stage, and one good final boss.
Nah, its not so special, not have many choice to do, like weapon upgrade or those things like damage upgrade. It also not complicated, mean its a simple piece of cake.
Its nothing new, no story whatsoever, but this one could pass just fine like a general arcade, means it was nothing out of ordinary or creative.
The design also simple, nothing much. The only strong point of this game is:
1. Simple and solid, no flaw or glitch.
2. Addictive and fun, not too hard.
3. So many guns, and guns.
The game is too easy, I only failed few times. This make the game have low replayable value and get boring soon enough.
Its nothing special but its work, too simple and plain but its fun. No excitement or such thing.
Still a decent game though, but I rather prefer something more fun, more exciting, more hard, more variations, even with some few flaw and mistake, its still have higher value in my eyes.