A Parallel Universe, Cryostasis, and Moon Base Fic

Okay, I just had this idea and was wondering if it was worth a damn. 
After some weird magical events occur in the Everfree, Twilight and her friends go to investigate. When they get there, the events peak and a massive wave of magic overtakes Twilight and Spike. Spike is unharmed since it was mostly heat, but Twilight is badly injured. Twilight awakes with a much older Spike to greet her. He helps her get used to her daily activities after being preserved in a crystal stasis for four thousand years. Of course Spike is reluctant to fill her in on that part, but he eventually comes clean and explains everything. 
She, as well as all other ponies, are now living in the Crystal Empire... On the moon. You see, after the incident, Equestria realized they were under attack from an unknown enemy. In a matter of weeks, many Ponyville and Cloudsdale are destroyed. Not long after, the three princesses decide to protect the Crystal Empire, Manehattan, and Canterlot with their magic. However, even they aren't strong enough. Together, they evacuate as many as possible to the Crystal Empire, assuming their magic united, along with the Crystal Heart, would help protect them. For a decade, the Crystal Empire served as the last city still occupied by ponies, but as the bombardment continues, they realize soon the Crystal Heart will be unable to support the shield. They decide that their last hope is to move the city to the only safe place left; the moon. 
Now, Equestria has been conquered, many of it's once great cities lying in ruins. It's skies and oceans now a bright orange, tainted with dark magic. 
One thousand years ago, Princess Celsetia and Luna wished to reclaim their world. They haven't been seen since. Cadence has ruled over all of Equestria's survivors alone, her husband long since dead from old age. Since then, Spike has been by her side, though their relationship has remained as it is now. 
For thousands of years, things have finally seemed to be a peace, but now that the invaders have found a way to find their way the Crystal Empire, Spike and Twilight have no choice but to go down to Equestria and end this conflict once and for all. 

Its a little like Attack on Titan, but minus the Titans. Also its in space. With ponies. On the moon.