The enemy path (the real bug is not on the door) and other bugs has been fixed on a new version, but I can't upload it until the votes of Indie Spain Jam period is finished.
If you kill the first enemy, you obtain the blue chip to unlock the door.
Muchísimas gracias por jugar al juego!! Me alegro mucho de que te haya gustado :D
Después de la Jam subiré una versión corregida y pulida de la build :)