1) I did not manage to make proper UI in time, so hidden upgrades are more or less a workaround to avoid it being too cluttered for now.
2) Should have missed something. Last hour pre-submission was pretty much spent on rounding down numbers. Its also weird as black hole should only ever increase by 0.1, so idk how 0.30000000000000004 happened. I will look into it.
3) Pretty much point 1
4) It is actually connected. You fill the first star to activate second star. And then each planet fill is supposed to increase star drain rate. There are also upgrades that connect them in more ways.
Gameplay-wise i didnt want to make it a brain-dead clicker, and if you check black hole upgrades there are actually different "paths" you can take to beat the game as you can buy BH in any order . Some more efficient than others.
Strange stuff is - the game is more or less stable when i open html file on my pc, but uploaded to itch a lot of stuff comes out. Guess thats my biggest takeaway here - should test stuff on itch rather than using the files i have on my pc in the future. And of course - thanks for the feedback.