I find it pretty hard to play the game. I see a text box in the manual but it does not do what I expected it to do, which is translate what I write in alien language. If I make a mistake and add a wrong item, there is no way to reset it or take it back.
There are also a lot of items there. Try starting with just 2 or 3 at first, to get the player to know the game. Also, instead of writing the whole sentence, aliens could say "3 zrrwq + 1 rlwqp" or whatever. There is no need to translate the whole, polite sentence. With some adjustments it could be a bit more playable but hey... it works!!
Another idea to make the game easier, is to mix up just 10 letters of the alphabet maybe, not all of them. Less to decipher, easier to play.