The page currently has 2 buttons that look like a ❓ icon —
they're hidden. To reveal them: open the HTML file, find the blocks with the class
reveal-wrapper hidden (around lines 89 and 100) and remove the word
hidden from the class, so it becomes just reveal-wrapper.
After that, the real buttons will appear instead of ❓: ✨ Regen and 🔄 Reset.
Clicking Regen starts a countdown: once every second the character's HP increases by 10, for a total of 5 times. The HP bar and text update after every tick. HP can't go above 100.
Clicking Reset instantly sets the character's HP to 100, no matter what it was before. The HP bar and text update immediately.