The horizontal movement slowed down when moving up/down which felt a little funny. I’m not sure whether it gets harder as you play for longer, but it was pretty easy and felt like I could go for quite a while. I would expect speed or asteroid density to increase the longer you play. I didn’t feel like I had to shoot very often, so the cost of using a carrot was pretty negligible. Perhaps you could introduce more reasons to shoot in order to utilize that tradeoff a little more.
Overall, nice entry and welcome :)