Well, sorry, every classic RPG has 90% chance you'll make a bad build on your first try. Though most of them also give ypu nothing for getting a Game Over, this game gives you unique scenes.
And it's possible to download the game and finish it in one run. There even exist achievements that encourage you to never up your stats. But that is difficult for newbie.
I personally could do that after spending about two month on learning all the combat stuff, but I had a lot of fun in the process, and keep getting half a year after being introduced to the game, so I don't really feel like blaming anyone who made it. The best porn game in my opinion.