The game in common is good, but very very bad is that cursor doesn't change shape in clickable areas. So, to complete the level you oftenly need to click on some small area which doesn't even differ from other nearby areas (for example, locks on one of suitcases, or panel on plane). So, to complete level without walkthrough, you need to be either extremely lucky, to click on the right spot, or extremely stubborn, to click on every millimeter of game screen. I don't think there are many of such personalities around. And I think you should leave player a chance to complete game without using walkthough.