I do think this game could have really done with a tutorial level to get the player acquainted with the power-usage mechanic. As it stands, there is an excellent feeling of desperation -- with some tweaking, you could really make it come on subtle, slowly, and really strong.
Aesthetically, though, you've absolutely hit it out the park. This game looks and sounds excellent.
I'd love to see this developed into a larger game: aforementioned tutorial level/s acquainting the player with their space ship, establishing characters and the world, making a nice difficulty curve over time, maybe even adding more things to juggle with the power supply.
Considering the time constraint, y'all did some great work. Well done!