You should add some presets too with customization, like certain levels and gold. For example lvl 10 characters 1000 gold each etc. Gold number is completely made up but just for example. And make alot presets like this. Lvl 3, 300gold - lvl 7, 700 gold - lvl 10, 1000 gold - lvl 15, 1000 gold - and so on.
This look like the multiplayer system of the last Xcom: Enemy Unknown, if there isn't any legal issue doing the same it was a nice way to match players using a certain amout of "customisation points"
