Pay attention to drops
We mentioned that aliens can drop power-ups to help boost your spaceship's growth as well as its attacks. Usually, the more you grab, the more powerful you get. Yup, so it's not just a one-time, quick then and then you snap out of it. You'll continue to become even more beastly.
The thing I'll say is to pay attention though. Not everything that falls is your one-way ticket to extraterrestrial beatdown city. They can drop attacks on you that'll make you lose your health So don't try to grab up everything because otherwise, you'll get whacked.
Fortunately, it's pretty easy to determine what's good for you and what isn't. If you see items with little arrows on them then those are usually good. If you see torpedo-looking things, then those want to kill you. In short, it's pretty obvious to tell, but it can understandably be confusing at first. This, especially because they drop you into a level right away.
Keep it moving
More than likely you're already doing this but remain on the move. You never know when a bomb is going to drop on you, so standing in one place is not a good idea. Sometimes it's easy to do that when you still have a few enemies to clear in one row.
But, just move around and you'll eventually come back to the row that you wanted to take out. Go side-to-side and be very careful if you go up towards the front of the aliens. The closer you get, chances are it will be easier to get hit because you won't have time to dodge.
Also, you never know how the alien scum will spawn. They can pop out in an area where you're sitting so be on high alert. I'd say to always start at the bottom of the screen. Then, if you're feeling bold and want to move up, then you can if it helps you eliminates aliens faster. But start low and keep moving.
Shoot at each boss' small points
Bosses in Alien Shooter are not as simple as just shooting them to death. Yes, they have your signature boss health bar and all of that good stuff. However, there are hit points that you need to keep in mind. Most bosses have parts of them that need to be destroyed.
Each of these parts has its own mini health bar. It may be wise to shoot the smallest areas first. This is because they are harder to hit because they are smaller. Take care of those tough spots early and get it out of the way.
Once you do, then fire away at the biggest remaining area, and finish off the boss. If you're struggling with beating a boss, don't forget that you can always change your difficulty level. The last thing you want to do is throw your phone across the room in frustration, am I right? But just pay attention to the boss' attack patterns and you'll be fine.