Thank you for the answer! Actually last week I've managed to extract assets from the game! I used KeMulator to run the game. This emulator has a tool to see what is loaded into memory and you can set it to autoupdate so you'll have everything from the game as readable big asset. It saves as PNG files. Unfortunately they are all low res.
Btw, I didn't know that all characters use skeleton based animation, I got it after looking on body parts pngs.
Here is what I've extracted: <deleted>
There is other Java emulator but I didn't test it yet: mpowerplayer