At its current state -imo atleast- the bigger asteroids more feel like a downgrade then an upgrade: It feels less satisfying to break the bigger rocks, and you don't know how much you hit the rocks for so sometimes you move away with them being low hp. You might want to think about adding a health indicator (could do it with 3 different crack states or smth). Also upgrades like density shouldn't make the rocks bigger. If that makes the rocks bigger explain it in the upgrade section.
Also for hit feedback add a small sound when hitting rocks to make it feel more satisfying.
You could also think about adding a scroll out mechanic and at the outer parts the asteroid are bigger and closer at the black hole they are smaller or smth.
UI and Looks of the game are cool and I def. can see it being an addictive gameloop :).
Viewing post in A Game About Feeding A Black Hole comments
agree on the density there are like 3 metrics that are not all super clear without some description: density, count and size
- count seems always great
- size is ok but as was mentioned seems like a downgrade at first since it takes too long to crack in early game
- density is ambiguous, and seems like it can be either be size or count, like is it density of an asteroid, or density of asteroids in the window