Added Items: Logic Gates (AND, OR, NOT), Signal Generator, Timer, Freeze Bomb, Gravity Bomb, Rotating Base, Ice Slowing Tower, Reconnaissance Radar, Signal Filter, Signal Combiner, Pusher. Please explore the specific functions of each item yourself.
Added Monster: Airship (Flying Unit)
Added a level challenge mode; 34 basic tutorial levels have been added to help players familiarize themselves with the game controls and item usage.
Modified graphics rendering, etc.
Bug fixes, etc.