Hmm, it should work with java on Windows and Linux, maybe not mac though. Is it not starting or just seems kind of broken? You should just have to write "java -jar (nameOfFile.jar)" in a terminal.
Worked fine for me too. Just once I had a crash, for some reason the game didn't tell me to kill the enemy, then I went to the right door and it crashed. The game is very simple, but I really liked the setting! I wish I could see the end of it... Can't vote on the Theme though, since there was no light on it. Graphics were very "sketchy", but I liked it, just some more polishment and it would be nice~ Mechanics were quite basic, but no complaint on that. With enough aggressive enemies it could get quite challenging. Anyway, good job!
Had to update my JRE to 1.8 if others are having problems still. Interesting game, one thing that bothered me was that dialogues would disappear while I was still reading them and the centering of the words was off so it was hard to read.
Applet is not currently working, I will fix it when I get the time! Sorry! "