I got through the demo and actually surprised by how it hooked me. The psychological hooks are all there. Electric asteroids were super satisfying to set off. I thought toxic asteroids were okay - but kind of fell short for being a successor to electric asteroid.
I got massive frame drops towards the end, though I'm not on a very powerful PC at the moment, I'd think it should still handle a simple looking 2D game like this fairly easily -so it looks like some optimizations need to be made.
The pacing for this demo was great, I think a count up timer would have been a nice touch so I could have a visual on my clear time, but if I could nit pick something, the tension for purchasing upgrades could be increased a teeny bit more for the full version.
I felt spoiled being able to upgrade nearly after every round. Perhaps you're attempting to alleviate on some of the grinding issue - but I think a little more grind wouldn't hurt and it would allow for a little bit more longevity. Essentially, I want to feel like I'm earning upgrades, not having them handed to me. There is definitely a balance to be struck there.
Overall, visually, I think this needs to stand out more if it wants to compete with big names, but under the hood, I think there is a solid incremental game that I'd be willing to pay a few bucks for.