Really cool concept! Although sadly I was not big brain enough to figure out a strategy that allowed me to get past 4 knights.
I think I actually would've preferred if the goblins ran away from the knights, so that they can lead the knights into more traps, rather than running straight into the knights and dying.
It also got me thinking, what if the player were able to control the goblins, to tactically position and move them to lead the knights instead. Thought that could be interesting.