At the computers where you deposit minerals you have collected, the interface can be very confusing to some people. It needs tooltips, one for the mineral progress bars and one for the mineral > crown icons. The tooltips should obviously explain what this represents etc.
Can we have popup dialogs or some such near each gate mentioning the name of the gate including popups near the computers mentioning what gate they are for? It would make it easier then having to walk right up to them and click on them to find out. The giant icons near them are pretty arbitrary and unhelpful.
Also when viewing your character you can look at your progress towards the next tier, however the lack of tooltips or any description at all makes it nearly impossible to work out wtf a "tier" is and what a tier is for.