"Core Gameplay Flow

Pre-Mission Prep:
At the start of each stage, review your current Troop Count, Gold Coins, and the two doors ahead—each clearly labeled with a troop modifier (e.g., “+X” or “–X”).

Shop & Upgrades (Pre-Combat):
Spend your Gold Coins freely in the shop to upgrade your squad:

Upgrade Weapons: Permanently increases each soldier's base damage.

Recruit Soldiers: Instantly adds new soldiers to your squad.

Purchase Combat Boost: Grants a temporary damage increase for the upcoming battle only.
(Note: You can purchase multiple upgrades simultaneously as long as you have enough Gold.)

Choose Your Path:
Select and pass through one of the two doors. Your Troop Count is immediately adjusted based on the door's label (e.g., Troops: 15 → 18).

Automatic Combat:
Your squad automatically engages and fires at alien enemies within the corridor. Enemy return fire will cause random troop losses during the battle."