trial and arrow terrain editor XD.
You are completely right a how to play introduktion is the missing point.
I will add one soon and "may be" add the remaining pieces we had no time to implement.
All you see was made with in the Jam. But at the end we had so to say "no time" for Gameplay, Ui, polishing or even testing and Bugfixes.
Definitely taking another path on the next jam and focus more front than back end.
But you did your best, I give you credit for that !!