Bugfix release

After being able to reduce download size I had some free neurons ready to work on other older issues like:

• broken menu after game over (or pressing Esc in game)
• broken game after first session
• unable to add animations to the game
• unable to use spritesheets for non animated sprites (at least not in a clean ad easy way)

I hope that after these fixes I can focus more on polishing the game and adding more content!