Cute idea, and I always like to see what people do with concepts like this! I think it could definitely use some refinement, though:
My biggest issue is that it assumes a cis, straight couple, when it feels like it would be relatively easy to make that adjustable. Checkboxes for what body parts you have / would like to be involved would make the game way more inclusive. (If pronouns are used anywhere in the game, then this should come with a pronoun picker as well.)
I also noticed some of the girl's prompts had her doing something to herself in a way that didn't seem intentional (e.g. "[girl], caress [girl]'s foot for 9 seconds"). Also, none of the prompts involving "eye" turned out sexy -- maybe there's someone out there with an "let your partner bite your eye" fetish, but I'm going to pass on that, personally.
This is a super minor nitpick, but UI-wise, the sideways timer makes no sense. Neither player is reading the screen from the side, even on a mobile device. There was also a five-second timer on a "[boy], [girl] will suggest a dare" prompt even though the prompt didn't mention a timer. There was also a misspelling of "eyebrow" / "eyebrows".
Seems like there's some potential here, but it's not there yet -- the big one is definitely not assuming a player's body parts or gender, but beyond that: letting players pick the rate at which the dares ramp up, what body parts and kinks are involved, maybe trying to work in other mechanics (like letting a player choose a spicier dare for a reward) to make things more dynamic.
Good luck in your future work, whether on this game or something new!