Can't play web or download :(

I'm sorry, I'll fix it asap.
There will also a post-compo version for the ones who are interested what I really intended to do but wasn't able due lack of time (coming approx. the next few days).

Fixed for now, gonna work on webstart now.

Running OS/X Mountain Lion w/ java 1.6.0-33

Wasn't able to start the game (webstart was broken as you said) and I got the following error by running "java -jar mutants_run.jar":

Exception in thread "main" java.lang.UnsupportedClassVersionError: com/se1by/Game/Game : Unsupported major.minor version 51.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

You are using java 6, but it's compiled with java 7.
I'll upload a java6 version.

linux version has same issue, can't run because of java7 requirement

Look very nice, but Web doesn't works :( And sometime crushes.

Well, there's not much gameplay here, but maybe you're onto something. If the monsters eat me, I can quit or return to game - that's kinda strange. Some indication that I'm killing the enemies would be nice (I didn't see any score counter and they just vanish). Highscore option doesn't seem to work (just a blank screen). Well - the game works, so it's not bad for an early alpha. Continue working on this, I'd like to see some post-compo version.

@marudziik:
Thanks, it feels really good to know that some people care about the stuff you do, reading your post makes me really happy :)
I will totally finish this game, even if it takes some time until everything is like I want.
Just leave a comment here if you miss a feature or something like that, I'll see if I can implement it.
Remember: I did it all for you ;)
I finally uploaded a post-compo.
It's compatible with java6 and got a few bugfixes and new features, even when I wasn't able to make it perfect in time.
More updates will come - make sure to check this site from time to time.

I tried to run your game on Linux, but it didn't work.
Here is the error log:

java mutants.jar
Exception in thread "main" java.lang.NoClassDefFoundError: mutants/jar
Caused by: java.lang.ClassNotFoundException: mutants.jar
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Could not find the main class: mutants.jar. Program will exit.

@kddekadenz:
Which distribution do you run?