This game is the half-life of flash games. Running in without a plan will only get you killed, you have to have use your brain and some tactics to survive. Sure it can feel like it's trail and error bull-crap but if you stick with it and learn the mechanics you'll get through it.
The only issue I have is the dialog and story is in broken english which makes it hard to fallow, I understand that translation is difficult and is often flawed, so of course I'm just happy that the dev of this free flash game went through the effort to translate it.