This app is an admirable idea, but a few minor tweaks I think would make it more powerful as a self-care tool.
Being able to go on multiple adventures a day, (maybe only the first one ‘counts,’ for the big reward, but the following ones give minor gold rewards, stamina, etc.,) could help keep the play cycle active and build a habit of doing a minor, positive thing each time you’re compulsively checking your phone.
Also, when doing a custom adventure, being able to type in your custom adventure in will help make it feel tangible. And, having a list of your old custom adventures remembered might be a good prompt, especially for ADHD, when you know you should do something but you just can’t remember in the moment all the things you told yourself you wanted to get done.