I played it for a while and it was fun, but I think it needs rebalancing. e.g. if the door in the upper left is picked as the first one, death is almost certain and unavoidable!
But I actually liked the idea, that instead the currency to buy/upgrade (your power) and your healthbar is the same! It's a concept I've never seen in a towerd-defence-game yet! This concept really has potential; You have to think every time before you buy something, because essentially you buy it at the cost of your health! Great Job for comming up with this!!!