Genre: Topdown - Tower defense - roguelite

Game idea: you are a new born plant, you are not able to move but to spread, after each wave of enemies, you will gain resources to grow, deciding which direction to grow will allow you to create specific buff and new means to defend yourself. Build your defenses, attacks and become and apex invasor.

References:

Spreading mechanic

Core Pillar

Developer Note: this one has lot of potential and seems feasible