Starchase also has a floating orb that leads the hero to a magic sword.
People were digging for crystals as slaves in a mine. Also, Zygon resembles the master ordering people to dig in Temple of Doom. Oh, and there's even a mine cart chase, although it's very brief.
The final ship battle is a lot like the destruction of the second Death Star, Zygon resembles Vader and gets his hand cut off, so many references it is uncanny.
Dag is clearly based on Han Solo, the ship on C3PO, the hilt on a lightsaber, etc.
Movie is reviewed.
movie is reviewed