It's not a question of difficulty as such. It's more that it's basically ignoring what has come to be accepted by the int fiction community as far as what constitutes a well-designed parser game. One prime rule is that if the description mentions an item, it should be able to be looked at (and any further items mentioned in that description, to two or three levels).
I can appreciate that that might not matter to you, but there are reasons for it that are trying to help mitigate the needless frustration that a parser game can generate when the interface gets in the way more than it helps. You might find the discussions in the int fic forums interesting.
http://www.intfiction.org/forum/(Or not. But they are there if you wish to look.)
Best of luck with your game!