I really couldn't figure this one out. The first time I did the attack for 2 damage it was fine, then the board changed and it never let me do that attack again. Even if I had the right combination of symbols it never switched to the top down targeting screen and it wouldn't let me do an 'attack all enemies' attack either. Not sure if i just didn't understand it or if this is a bug but it also would randomly highlight symbols I didn't want as if they were attacked to the chain.
I also think you missed out on the 'adapt a mechanic from another game' part of the theme, although the choice to just play with dimension was interesting.