Damn I wrote 5 instead of 6, and also managed to get the WASDEQ text wrong this year again as I always do (what's written is a weird mix between AZERTY and QWERTY keyboards) :\
During fights you can use the arrow keys or 789UOJKL but it's only written on the game page and not in the game.
The weird walls are seed walls, you need the chicken in your party to eat them and be able pass through, otherwise you can't.
Thanks a lot for playing, sorry for the UI problems and I'm glad you enjoyed it anyway.