...and needs more explanation to creeps' weakness and resistances, and regarding inmap upgrading (silver and gold orbs). Upgrading a type of orbs to silver or gold must not cost anything (i'll pay only for upgrading any single orb).
the game depends too much on the luck of the player. need the possibility to "sell" an orb to replace it. when upgrade ingame over 200 kills, no mana spent. and the creeps...you need to make them a little bit less strong.