Time Tenshi Paradox was suppose to bridge the gap between Time Tenshi 2 and Super Time Tenshi. Silver Cow Studios decided to abandon Time Tenshi Paradox, and likely Super Time Tenshi. They then decided to remake the first Time Tenshi. Time Tenshi is the remake and Time Tenshi (2015) is the original. The remake is a new timeline/alternate universe with the same characters. I haven't finished it, but I believe the game lacks breast expansion giving its poor reception. I stopped supporting Silver Cows Patreon a while back ago because of their negative stance towards breast expansion.