Ishar for me has the alluring quality that several Silmarils games do, it’s that it feels like a real, living world, like the game is deeper than it actually is. Metal Mutant and Starblade also felt that way. It may just be skin-deep, because of the nice graphics and realistic ambient sound, and possibly also the language barrier.
Unfortunately, Ishar also shares the curse of other Silmarils games. They’re obscure, hard to make sense of, player-unfriendly. I never got very far in Ishar, so this is just from reading the walkthrough – there were steps that were important, but also non-obvious.
In general, I got the feeling that the game doesn’t tell you many things you will need to know in order to progress. It might still be worth trying, especially if you don’t mind looking up stuff when stuck.