LÖVE

The simplest way would probably be to force the player to do each move, and not do path finding.
Of course, it can be annoying to have to do each move, but it's way simpler for the programmer to do it this way.

hello, thank you for the link and advices.
For the moment I think I'll look for a game project a bit simpler, and then I'll go back to this one

Good luck