I think there's a lot going for this game! "Injured" and "healing" blocks are a take I haven't seen before, and I like what it adds.
I'm glad to know you're still developing it, because it shows promise. I think there are a few things it does need: I found the need to click twice to select a new block (once to deselect my current block, and then once to select the new one) an unnecessary slowdown; the blocks also had a very slow repeat rate, so moving something from one side of the screen to the other felt like it was taking twice as long as it needed to.
And there's a lot of story being glossed over! I hope "minor story elements" includes things like introducing Duran, and the gargoyles, and so forth.