Too short, but great concept.
As far as playstyle goes, it's a very short game and there isn't so much motivation to keep playing after a game to get a higher score. I very much enjoyed the chain reactions and such though, and how the robots did different things. Maybe you could lengthen the game by having a quota each level, and having it so that players cannot advance until they reach it. It just seems a shame, because clearly you put a lot of work into the game, but i'd imagine it only holds most people's attention for about 2 minutes at most. I'll just speak for myself, my life sucks enough that 2 minutes of escape is insufficient.