To upgrade the temperature, you have to click on pink hearts.
They have a 5% chance to spawn and a 2 second timer. After that, they became blue again.
To finish the game, you need to be at 10.000 points, naked ( 37°C) and legs open.
The legs open every 5 clicks when the girl is naked.
If you just use your slime power, legs won't open because it's in a cooldown, but if you're at 10.000 points, the cooldown will reset and you will just have to click 30 times.
If you still have any issues let me know!