Hello!
Oh, that's weird. I've googled it, and there are a few possibilities: first, it says that you might have downloaded the wrong version of the game for your system, so if you can, try running another (if possible). E.g. if you downloaded the "WIN" version, try the "PC" version. The other option is that your antivirus is blocking Ren'py (the engine the game was made in), so you can try whitelisting it. The next thing you can do is change the location of the downloaded game. Personally, I unpack (unzip) downloaded files on my desktop, and then put them in different folders manually. The last option I found, is that sometimes when your "user" name has some sort of non-ASCII character in it, and your system is set to an encoding that can't represent the characters in your name. But from the message error you posted, I think it's not your case. Well, if any of these help, let me know. In the meantime, I'll try to look for another solution.
Haha, I am glad you liked them! Oh, really? Wow, it's nice to hear, thank you! I am working on the next update, though it might take more time than this one since I'll be doing three routes. It should be done reasonably within the month, but I can't promise anything.