The blue chick just stands there, tits out, while the tentacle goes to work. I picked the face option first because the cum button was right there and my thumb slipped, honestly. The weird greenish goo shot all over her nose and cheek and it stayed there, dripping, while the next round loaded. You don't get many of these browser hentai things where the aftermath hangs around like that. Usually it fades or resets too fast. Here the mess just sits on her face while you scroll the actions again.
The actions themselves are basic. Tap a tentacle, it moves. Tap another, it does something else. There's no real puzzle or timing thing. But the loop got me anyway. I kept pressing the same one over and over, the one that makes her hips jerk forward, because the sound design, if you can call it that, has this wet slap that's way too loud. Like someone recorded a hand hitting a wet towel and turned the gain up. It's dumb but it worked on me. The blue skin and the halo thing, yeah it's supposed to be Cortana or whatever, but the face is generic enough that you stop caring after a minute.
One thing nobody mentions. When you finally hit cum while a tentacle is still inside her pussy, the creampie animation loops for like ten seconds. The goo keeps pulsing out. I sat there watching it, not even touching the screen, which is weird for a game that's basically two buttons and a blue chick. My only real complaint is that the facial cum looks more like alien snot than actual jizz. Wrong color. But maybe that's the point, she's not human so who knows what the plant stuff is packing.
If you're on mobile, just tap the bottom right corner blindly. That's the cum button. Don't overthink it. The tentacle will do the rest.