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In my opinion there are two things which makes this game unplayable. First of all the energy system, that gives you only a very limited window to play and second the unbalance in leveling and promoting the hero's and defeating the campaigns. The combination of the the two takes it far too long to get to the next campaign. Graphics look very nice and the rest of the gameplay is nice too. Just please fix the energy system and balance.
It looks like the PvP part is really unbalanced. With 2x lvl 13 and 1x lvl 14 hero I'll get opponents with as a minimum a lvl 16 hero. Chances to win are minimal in those cases.
try switching weapons instead of reloading when you have clingers, although reloading speed levels up on use.