1up has an interesting preview of Alien Syndrome posted and it talks about the graphics, gameplay, and other features of the game. Here’s a blurb I found interesting, the ability to go back through the game with the character you have leveled up after you beat it once through with her current stats intact:

The playable character, Aileen, can improve the odds of her survival against waves of progressively tougher alien enemies by making use of the new experience system. Adding role-playing flair to the simple moving and shooting, the game has Aileen collecting resource points from defeated enemies and using them to build up her strength, speed, accuracy, and health. If after finishing all 40 sprawling stages you still want to improve your stats, you can replay the entire game (at a higher difficulty level that you just unlocked, if you want), with your experience held over, and level all the way up to 99.

Here’s a trailer for the game based on the PSP version which is supposed to be very similar to the Wii version: