Sad ending…
It’s now 2.45 a.m.
I’ve just began writing the tutorial… And not finished yet. I think it would take me another hour to make it. But! I have to go to school tomorrow noon (I’m a little, really, a little, sick and asked for a leave) 
I think I’d better go to bed now, leaving my work unfinished… Thank you, guys. This is my first LD and I enjoyed it very much 
Here (on GitHub) is what I left. If you have nothing to do, you can take a look at it. The code is not clean though commented!
Keep working and good luck everyone!! See you in August… probably?