Scammed me?? – OPUS: Rocket of Whispers Review

I downloaded the game and played the beginning that the game allows you to play at first. When I finished it, it allowed me to pay 50% of the original price to play the full game. I thought it was a pretty good deal, so I payed 0.99 for nothing. It asked me to pay again, not allowing me to play the full version. What is this???
Review by Devina were were on OPUS: Rocket of Whispers.