Very good!
I know alot of people are complaining about the aiming syste4m, but I actaully appreciate it. I mean yes the enemy is getting off alot more shots on me but it adds a level of difficulty when not all of your shots are dead on.
I also like the enemy AI for the game. They seem to know your presence from far away and can actually jump to try to hit you. There were a few "extreme" cases though. I forgot the level but at some point one of them had a more advanced laser rifle, the one with the yellow beam? Well I jumped and he just rapid fired 3 or 4 of those at me and I went from 50->-8.
Regardless, its a really fun game, and I'm sure eventually I'll finish it. I have the habit of taking a break whenever I get a game over though (wrote down the codes thankfully)