I will give you 4 stars because of the combo box problem: for some combo boxes, you have to use the arrow keys to find certain options, and there is nothing indicating that you must do so. If you could add a scroll bar or a down arrow, then that would be great.
Apart from that, I found this game very interesting. Too bad that it was short. I have actually learned some of this before, but I never got the opportunity to put it to the test until now.
The story was very nice, and the atmosphere was very portal-esque. I loved how, at the end, you used different letters from different writing systems for the guide at the end instead of the standard x and y. It really added to the sense that you are being trapped here by a malevolent force. Were it not for the problem I stated at the beginning, I would have given you 5 stars.