Great foundation for the game, but for 2~ hours and noticed that the building upgrade system kind of makes conquering other planets obsolete (or at least very unrewarding during the time I've played). Maybe require there to be a research for building upgrades, so that you can't just dump all your money into a single 10x overclocked mine, research station and energy station. Later having some automated way to conquer the galaxy would be dope, with fights being maybe more sparse. Currently it makes no sense that you can have 1 uber planet that generates more resources that the entire galaxy would with level 1 mines. Another thing is that clicking the button to collect resources gets old very fast - I have the patience, because I've played previous Helixteuses, but it'll turn off most people.
I think the game would benefit from plateauing on upgrade/technology multipliers for production. For example, make a 100x multiplier a soft cap for how much better the production of a single building can get (with very hard to get upgrades, that maybe later boost it to 120x). Otherwise if progress stays the same way it is right now in the final game, the game loop will feel very stale. You don't need 10s of levels for upgrades, 10 levels, each requiring a more advanced resource would be more than enough and it'd be more elegant gameplay-wise. Best incremental/idle games distinguish themselves by not just being a number going up simulator, but by opening up more gameplay mechanics when the players advances. Forcing the player to literally conquer galaxies would lead to much more fun gameplay.
Also I'm not sure if it's intended, but I don't see a way to mass-overclock buildings which seems really bad.
Edit: Played some more and realized that materials matter 0% after like 3 hours, unless I'm missing something. I can build pretty much anything, but my only bottlenecks are cash, energy and research.