Nice game! I have a LOT to give feedback for:
For the UI:
The tool-tip being transparent is a nice touch, BUT they get hard to read with the filling bar behind, since they have similar intensity levels (the bar and the text). Up the alpha a bit or add more separation (so they don't overlap).
Onto the filling bars, I would like to separate the buy button. When lit (affordable), they are almost indistinguishable from the filling bar.
Move the gain on buy onto the buy button, so there's only the current production number on the bar. As it is now, it gets confusing as to what is what. The plus sign should be used for the gain on buy, not the other way around.
The color of the filling bar is too intense. You may want to add an epilepsy warning, or tone it down.
Add a buy all button. On games of this style, they are a must. More so since it's fast paced.
The windows. They should hide/close the others. As of now, the settings window is on top of the upgrade menu, on top of the expanse menu. You can't access the window bellow without closing the one on top. Add also a close window button. Moving the pointer back and forth is not the user experience you want to give the players.
At some point the bulk buy stopped working. You may want to check on that. I tend to switch windows/tabs a lot on my PC.
Onto the actual game:
I don't know were you live, but food business should be up or above the mineral one.
There's a serious unbalance between the first businesses and the last ones, starting in the order of 10^12. This means they quickly get irrelevant in the play-through. Try to add more upgrades for the first businesses.
The upgrades. Move the temporal ones to the main area, you have the space. The limiter for early credits is too low, makes getting levels 2 and 3 irrelevant after a couple of prestiges. You may want to remove the limiter completely.
That will be all for this time. Don't feel pressured nor down. It's a good game overall!