Hey mate, thanks for playing my game!
So for the normal ending, you actually dont rescue your daughter, but an alien clone of her. In the last picture, you can see her eyes suspiciously glowing, and he also notices he hasn't aged in 8 years...!
The true ending, you find her lifeless fossilized. So in reality you could have never saved her.
I know it's a bit confusing, due to lack of time and actual lack of writing skills, I decided to go in a vague way.