Shooting and destroying asteroid feel very good and polished, you did a good job here.
However, movement still doesn't play well (very slippery like some feedback you already received). After a few minutes, I found out that it's best to stay near the middle of the screen and just try to shoot asteroids that come your way. It's just that when I want to get a power-up or avoid unwanted item that I do move the spaceship. And because of that, I always slammed into the asteroid and died.
It would be clearer if you show a simple pop-up text when you get the power-up to clarify on what that gives you. The 3-bullet is very clear so it doesn't need mentioning. However, I find the extra-speed power-up is very annoying because just a simple nudge cause you to crash into an asteroid. I imagine showing a simple pop-up text is very quick to implement so this would be my small suggestion.
Also, regarding the spaceship scrolling to the other side of the screen when you reach one end is OK. The problem is that the asteroid seems to spawn around that area. For me, when the movement get out of hand, it's mostly a matter of seconds until random asteroid spawn and I ran into it.
I played for while and can only get the score up to around 5000-7000 before crashing into any asteroid. I personally think the game need more varieties to justify higher score requirement to get to the next phases. I think adding more power-ups with different shooting patterns may make the game more engaging.