0.2 post jam update

A quick post-jam update to try to make the game more challenging and interesting. Most of the changes are the level design. I didn't change the game mechanic

UI:

• Cancel skill by click on the skill button again (you can still cancel with right click)
• Click-able zone of the skill buttons are larger
• Button in the turn order list are smaller

Graphic:

• Changed the Hack ability image

Game:

• The game is now 11 missions long
• The level design are changed (more challenging, hopefully!)