Hello Chat Noir,
thank you for the comment.
I am still working on the full game (on my free time), it is on a good way.
Following players feedback, I integrate some features not initially schedule, like a ingame tutorial.
319 is a really high score !? I have not done it when I developed the demo :D
Maybe you have done the highest possible score (demo is not balance, there is no enough "life" available to kill all monsters).