CellCircuit

"CellCircuit" is a reverse tower defense game where players take on the role of a doctor commanding immune cells to battle within the circulatory system. 

Your cells start from the heart, travel along blood vessel pathways through various organs to fight against viral defense towers, then return to the heart to begin the next circulation cycle. 

The basic controls include left-clicking and dragging cells to change their positions, right-clicking and holding to sell, and clicking the departure button to start a round.

 The core resource in the game is oxygen, which serves both as a purchasing resource and a life countdown timer. Red blood cells restore oxygen based on the distance traveled, and destroying organs also restores oxygen. 

Players can use oxygen to purchase three types of cells: white blood cells (basic attack), macrophages (high health tanks), and red blood cells (generate oxygen but have no attack power), deploying them in the initial grid. 

Players can control the direction of cell movement through mechanisms on the levels. Enemies include basic towers, lung towers, and liver towers. 

Cells become stronger after completing two circulation cycles. 

The victory condition is destroying all viral towers, while the defeat condition is having all cells eliminated with insufficient oxygen. The entire process emphasizes the strategic nature of circulation mechanics and resource management.