Its hard to tell from the video, but your player cant just push the enemies
around, he has to whack em with his sword (left mouse click) before they move.

Or, if you sword isnt moving cause your animations arent done yet, try
positioning your player so the sword is touching the enemy, then hit left
click.
Otherwise you'll need to get the animations done and the sword attached first.

The player script only checks for sword impact whilst the left mouse is pressed.
(player.c around line 180)