Some abilities and structures were under utilized, so things like the mech were moved to be unlocked during the third map and received a huge buff. There were more balancing changes related to what abilities unlock at which maps as well
Improvements
French and Italian Proofreading
The entire soundtrack was remastered
Bug Fixes
It was possible to put buildings outside the map.
The Flamethrower and the Energy Gun sometimes weren't showing the ammo.
Few bugs related to the Boss of the third map.
On day 20 in some cases the Boss health bar wasn't appearing.
A rare bug that after a specific situation the sounds would turn off.