As soon as you spawn, you are spawn camped by multiple asteroids from all directions which makes it impossible to not lose health as soon as the game starts which is really unfair.
The window that the game is in is tiny when it comes to scale and it seems like your ships takes nearly up the whole screen, which makes it tiring to move the mouse around and also makes it hard, as you gotta have extremely fast reaction times when multiple asteroids are coming around which makes it unfair not difficult.
The game needs a lot of work to get it worthy of being uploaded, id suggest playing successful asteroids clones and see where they went good and when bad and try to learn from their mistakes.
Wish you the best of luck on your future games, hope to see you making awesome games :)