A space shooter / arena shooter where all the enemies seem to have a magnetic attraction to you.
Ever played one of those games where it seems like an ambush? Kind of like if NaaC was an easy game? This particular title aptly describes the very game it is the name of. Because it's like an ambush, you see.
Anyway, prepare for an incredible learning curve. The game will not treat you like a baby for any amount of time. Within seconds of starting the game, around fifty enemies appear on screen headed straight for you. If you survive that onslaught, another stack appears from the side. Sometimes the first wave comes from underneath.
To shoot sideways and down, you rotate with the number 1 and 2 keys. This can be difficult at times, but like mentioned above, there is a sudden learning curve here. Fortunately, throughout the game are randomly dispersed pick-ups. These involve mainly more bullets and can be quite interesting at times.
So for a simplistic, but very deadly shoot 'em up style game, which is set in space and is kind of like an arena shooter - look no further.