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In the house:
We want Alba and her dad are gone. We must find them. Look around the house. Only the bottle is on the table. Take the BOTTLE. Look at the nice Christmas tree. There’s a bright star on top. Alba loves the star. Take the STAR from the tree. Leave the house through the door on the right.
Talk to the dragon. Has he seen Alba and dad? Yep, they went past him to the valley. So we move along as well to the right of the screen. There we can see all unicorns. And there’s a fountain. Try to talk to the unicorns. You don’t know how to speak unicorn? Walk back to the left of the screen. Talk to the dragon again. He suggests to drink form the fountain. So let’s go back there.
You can’t drink the water from the fountain like that! First you use your bottle on the fountain. Then you can use the water to become a unicorn. You can talk unicorn now. Talk to the smiling one. It’s dad. Talk to him about Alba. Lost? We must find her. It’s a good thing you brought that star. Use the star on every unicorn until you found Alba.
Game source: A copy of the game was found here  on the internet.