Entity was hard, but it was all about getting used to it I couldn't get much further in the game as well but one day I did, and did not stop until the game is finished, not much advice to give really
If it doesn't seem possible, WinUAE has a save/load function! It's not cheating after all.
And Dune 1 rules kriz! (finished in a few weeks but it's quite linear and and I finish it again in a day two or three times heheheh)