Not fun. Boring enemies. and ONE WEAPON.
You say theres 12 different upgradable weapons, but they're exactly the same, little line bullets that really don't do anything. The enemies are almost impossible to hit because of this, and you'd think that if you run into a lazer, even from the side of it, the lazer would still damage you right? Well not the lazers you fire, they'll go right through enemies if they don't hit them dead center.
So all the challenge in this game is coming from bad weapons and hit detection problems.
How did this get front page again? This game is complete crap.