All the game development was done by Haseeb Ansari. Haseeb is able to take any concept and make it a reality. He implemented integration with Apple Health and Google Health Connect, background step syncing, streaks, and rewards, as well as fully customizable drag and drop rooms for each pet, wearable clothing, and social features like adding friends and sending gifts. You can see the full development breakdown of the project on his portfolio website ~ mhaseeb.dev.