The lightning gun will now stun the boss and a hint will show that you need to punch the bird
added option to turn on/off camera view relative input controls for each player
added a description of what each upgrade does
better explained what the balloons are for in the tutorial levels
updated how/where enemies spawn in each level
added "POW" cardboard effect when punching spiders
made it easier to turn on/off the CPU hands when selecting a level
fixed a potential upgarde dupe bug
various behind the scenes bug fixes/stability improvements
Demo Update Released 1.1.2.2
Source: Steam Community (opens in a new tab)