Here are the optimized routes I used to get through the game for anyone looking to refine things further!

// c64

GET FLIN, D, CLIM TREE, CUT ROPE, CLIM DOWN, GET ROPE, S, E, GET BOAR, W, BRID RAVI, DROP FLIN, DROP ROPE, W, GET GUN, THROW GUN, E, GET GUN, GET ROPE, N, U, E, N, N, S, GET GLOV, WEAR GLOV, E, W, N, GET ICE, X AROU, SLID D,

TIE ROPE, D, GET MAN, S, KILL MAN, N, GET MIRR, S, FIRE FIEL, FIRE FIEL, FIRE FIEL, DANCE, E, GET MOTO, W, ENTE SHIP, INSE MOTO, PUSH AUX, PUSH 4, PUSH MAIN

// jupiter

GET FLIN, D, WITH FLIN, GET ROPE, S, E, GET BOAR, N, USE BOAR, GET GUN, USE BOAR N, W, W, USE ROPE, GET MAN, DROP MAN, GET MIRR, USE GUN, E, OPEN DOOR, GET KEY, W, W, S

SMAS FIEL, SMAS FIEL, DANCE, KILL SECU, WITH KEY, PUSH 3, PUSH 2, PUSH 1, E, E, GET MOTO, W, ENTER SHIP, PUSH AUX, PUSH 4,

//zx80 version

GET FLIN, D, WITH FLIN, GET ROPE, S, E, GET BOAR, N, USE BOAR, GET GUN, USE BOAR N, W, W, USE ROPE, E, GET GLOVES, WEAR GLOVES, W, GET MAN, DROP MAN, GET MIRR, USE GUN, E, OPEN DOOR, GET KEY, W, W, S

SMAS FIEL, SMAS FIEL, DANCE, KILL SECU, WITH KEY, PUSH 3, PUSH 2, PUSH 1, E, E, GET MOTO, W, ENTER SHIP, PUSH AUX, PUSH 4,