Everyone says it's too short, but if you try to not power through it, it's worth the money. I tried to switch up my fighting style as much as possible and kill guys with all kinds of different combos. I didnt just use the BEST ability and spam it and power through the game. I even re did some of the early levels before I was even half way through the game and killed guys differently with different abilites and to also get stronger before the later lvls.
Then there's the challenge mode. I spent HOURS topping the leader boards on a handful of those challenges that are REALLY fun. Overall, I haven't beat the game yet but I have invested at least 30 hours into it.