Survivor doesn't have any memorable moments and is a typical shooter.
The Good: Easy enough for casual players, playing as different characters is fun, weapon upgrades make a difference
The Bad: Bland environments, stupid story, bad level layout, boring aliens, slow paced, character upgrades are all the same, doesn't look very good
Shadowgrounds was a pretty doesn't shooter a few years ago, but Survivor doesn't really do much new, and is pretty boring. As a top down shooter you play as a marine who is trying to escape a ruined base that is overrun by aliens. The weapons are pretty generic with shotguns, assault rifles, flamethrowers, grenades etc. You can pick up health packs, ammo, and OK you know this formula already.
Unlike other better shooters like Alien Shooter the game doesn't even offer intense moments. There are a few straggling aliens coming after you and maybe a few hard ones, and that's it. You can easily kill these guys and it doesn't feel very satisfying at all. You can shoot barrels, toss grenades, or just run around holding the fire button and you'll beat these guys. Ammo is plentiful so you never feel like you're "surviving" and it's pretty hard to die.
There is an upgrade system that you use by finding "parts" and when you level up you can use points for different upgrades like sonar, health boosts etc., and each character you play has the same upgrades? That's pretty lame. While each character has a different load out there's just nothing exciting about it at all. The game is fun however since it's good for more casual players who don't like the intensity of other top down shooters, but even the aliens are generic looking. Instead of creepy deformed things you just get typical bug like aliens.
The game doesn't look or sound too good either, and the music almost seems non existent while the game looks pretty bland. The level design is also pretty bad since I wandered around areas and didn't know where to go like shooting a glass panel to open a walkway. There is no hint, the panel doesn't even light up or flash. So this is bad level design, and the whole freaking game just feels boring! The game is a little fun if you're bored or just want a decent top down shooter.