Thanks again ! I actually had people playtesting but they all speak the same language as me, the weird phrasing or 'on-english word weren't really a problem for them :/ I guess I need to find a native english speaker for this kind of task. Let's pretend O.T isn't english either.
For the last puzzle it's hard-coded, getting to the end required making only the first right step so you didn'tmake any mistake. That's a bit the lesson of the last level: sometimes making the first step is all you need to do even if things further along the way seem complicated. The rules are contradictory but do not apply to the first move, unless I made a mistake.
Thank you for the feedbacks !