Totally agree with Kenkage on the XP, I do wish to see maybe some usable items as drops from monsters/bosses as well as the character automatically using it when it needs to.
Needs different backgrounds, stats, more helpful help, MORE UPGRADES maybe a second currency, other items, other equips, NPC's a questline? Just too bland, but a nice idea.
I would enjoy this 10000 times better with class selection. Also, an interesting approach to the evolution of this game would be to stray from the idling bandwagon. Too bad there's no more updates :(