I had some hard time to start your game (it look like my java version is a little old, but it work well with the standalone jre used by minecraft).
I'm not a great fan of the render effects, everything look blury, it's hard to see what you do 10m in front you, but that give a certain style to the game.
The ambiance is cool and well made.
I had one time some spiders that disappeared without reasons.