All That is Under the Air

I ran the game with the following command on my:

$ java -jar atiuta.jar

Then I received this following error, which I have never before seen.

Exception in thread "main" java.lang.UnsupportedClassVersionError: all/that/is/under/the/air/LD30Main : Unsupported major.minor version 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:270)
at org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoader.java:56)

This is my java version:

Java version "1.7.0_65"
OpenJDK Runtime Environment (IcedTea 2.5.1) (Arch Linux build 7.u65_2.5.1-3-x86_64)
OpenJDK 64-Bit Server VM (build 24.65-b04, mixed mode)

@TMKCodes, Sorry about that; set the standard for compiling back down to Java 1.6 it should now be playable down to version 1.6 as it was only playable at version 1.8

You got me to read text... I feel your motivation to express those things on the topic of rich/poor separation. It's a topic I dwell on a lot too. However it would have been nice to see it all in some gameplay mechanics. Audio would have been nice too. You should write a little interactive story and not bother about making it 'a game' or toy if you want to get that stuff out your system. Games do have a lot of interesting tools to tell a story, but i would not make a game just to tell a story. You could make a story and entertain that with mini games... (you know, approaching it with a different mindframe) ... Im just trying to give something 'constructive' (I don't believe in constructive critique, but I tried =) And anyway it's nice to hear that you feel improvement in your skills and keep that up! It aint easy to get things done. Congratulations!

Hister-ish enough for me to like it ;)
Since game is more story driven than anything else, I'd like to see some more of this story. Especially since the end is sudden and unexpected.

Kind of a walking simulator, but the jumping in the later part makes it more than reading. Deep story (or something like that, it's definitely a story).

Sometimes when jumping against blocks I get set atop them. Bug?