Hi, sorry for not seeing this, if you make a text file in the game's folder and save it as a .bat file with this in it:
start java -Djava.library.path="./windows/" -jar "Generantis.jar"
It would run the game using your default JVM options. The reason why there are JVM options in place in the current version is to reduce lagspikes and improve performance. Hopefully that works, and I'll probably end up including a batch script in every release so that there's a plan B (and also fine tuning the JVM options.)