Ok, thanks for all your advices..
For the graph mode error, it must be fixed now (I'm going to upload new version..)
For the readme file, menu, etc.. I planned to do that, but it was just a beta, essentially to know if it worked on others computers (2 of my friend got the graph mode error, and i was little afrayed )
So, There will be better graphics, sounds, menu, maybe a tutorial in the finished version
btw, you already have this game in US ? I thought it was a french game (I used to play it on zonejeux before recoding it..).
Anyway, thxs to all, I'll let you know when it's finished !