How does your game represent "Power"?
Flower power:
"Power is a tool to reach goals, not the goal itself"
Use superpowered flowers to fight enemies.

Gathering:
"Power begets power"
Gather power to challenge intruders and protect your home.

Emergence
"Synergies between powers can create more than the sum of their parts"
Find ways to combine your increased power with flowers and their strengths.

Power of Nature vs Power of Metal.