Thank you! Glad you liked the atmosphere! There is actually just a single ending to the game and I'm curious what you did different to change things slightly.
SPOILERS BELOW:
Final sequence can be started with or without failsafe systems disabled. The lighting effect prior to final sequence (static glow of the tower) is different when all systems are in correct configuration (failsafe disabled, reactor on) vs how I had it originally (failsafe enabled, reactor on).
This made me think the ending was determined based on how you activated everything, so glad you cleared this up!