There are only three endings on "Her Tears Were My Light": Space Ending, Nil Ending and True Beginning.
The people that wrote about the "to be continued" ending made a mistake that I've just corrected. They commented the wrong game. They were meant to be for "Romance Detective", another game made by NomnomNami. It was supposed to have a sequel that was finally never finished.
If you like NomnomNami works, you can also try her three other games on Sandbox Adventure: Syrup and the Ultimate Sweet, First kiss at a spookie soiree and Romance Detective.