Gave the demo a try, and I have some suggestions.
First, it's a bit awkward using the mouse for every screen movement. Maybe add some keyboard commands, like using the arrow keys or WASD to scroll the screen?
Second, I felt like the options were a bit lacking. Having a windowed mode would definitely be a good idea IMO, so I don't have to miss messages my friends send.
Third, I feel like the reroll system being the only way to customize characters is a bit disappointing. Maybe add a more expensive option for full customization?
Finally, I feel like the upgrades don't offer enough of an upgrade for their price. Maybe add some global upgrades, like a multiplier that applies to all girls?