Alright I played your game. I have some things to say about it, but it's all just opinions, I'm saying it to help you. Here's what I think:
- This game is no where near user friendly
- The controls seem so delayed, I know you might have done this for a reason, but I think the controls could be improved.
- The bullet range is VERY short. I think if it was extended it would make the game a little more fun
- Another suggestion is that the further the game goes on, the faster the asteroids move towards the planet
- Your artwork could be improved. You may not be an artist, or maybe the art is for testing, but you can always post a job application. Plenty of people would be happy to do simple art for free.
- The background is very simple and plain, maybe add a space background?
- The bullets are a bit odd shaped and are very large, try scaling them down a bit
- The game is lacking effects and "juice", try downloading bullet trails, prettylight, and other extensions to help your game look fancy
- Adding a menu, save and load, pause, and possibly a weapon shop would be really cool
Now that I said what I think could be improved, I'll say what I like:
- I like the font for the score
- You have a good idea going, don't give up!
Here are some extensions that might help you:
Prettylight:
https://marketplace.yoyogames.com/assets/2493/prettylight
Bullet trails:
https://marketplace.yoyogames.com/assets/212/draw-trail
Lasers:
https://marketplace.yoyogames.com/assets/3823/lasers
Don't take anything I said personally, I'm only trying to help you advance in the development of your game. Don't get me wrong, these types of games are really amazing and are loads of fun, but you have to think of what the user depicts of "fun". As of now, your game does need work, and I realize it's work in development. I think this is an interesting project, but the next thread update you post I would like to see more screenshots, possible a video, and some amazing updates. I know you can do it judging on how amazing your game is now. Keep going, don't give up, and great job!