So, my suggestion are
1) Add volume control
2) Add level select
3) Add a timer so the "high scores" tab make actually sense
These 3 things should be very easy to do ;)
Nice puzzle game, no story (it isn't really a problem for this genre), very simple to understand and use (though not original idea, already seen some similary games), good looking but not very complete user interface (for example, one can't select a level or regulate sound).
25 levels, the is neither long or to short, it's in the middle.
For a puzzle game, 8/10.
It's pretty fun, but very, very unbalanced... and the oil company is WAY too OP, it makes thousand of times more money than all the other business combined
 "Jackstraws"){kind=icon}
 "Idle Business"){kind=icon}