Hey this is my favorite game from the entries that I've played. It looks like you used spine - did you buy the full version?
Ah ok, I have spriter but never got around to trying it with libgdx. It looked like there was some setup involved...was it easy?
It is easy to use it with libgdx, you only need to export your animation as a .png spritesheet (horizontal or/and vertical frames) and create an Animation with all frames, so in code just do a TextureRegion.split and fill the Animation with all frames, you can see my code here (line 176-186): Code
Hope it helps! ;D