Many devs these days use version numbering systems which don't actually count up from 0.1 to 1.0 - I've seen loads of games go from 0.1 to 0.9 and then continue 0.10, 0.11 etc. I'm guessing it's the same for this game.
To anyone who's hesitant to try WaL because it's not finished: The game might not be 50% done, but what's there right now is awesome (and free)! The art is amazing, the characters are really likeable and the script genuinely made me laugh out loud a bunch of times. So don't let the version number hold you back from trying this.