I'm sorry you are having difficulties. That issue is unforeseen, I even made sure to test the game on windows machines.
In about 2 weeks a massive code refactoring and performance update will be coming up. With some gameplay and map updates to boot.
I will also try and bundle the JRE with the executable file.
If it is not much of a bother, would you be willing to eventually see if the update that will come in 2 weeks time fixes your problems?

