Great voice acting, I liked that they had a lot of different possible lines to say and it wasn't just one thing repeated. It gave me 90s vibes right away when I looked out into space, which reminded me of Duke Nukem 3D, there was a level with SpaceWindows like that. I did get spooked by a RoboGrandma at one point. I went into a room and one was right there, which made me audibly gasp, so good job! This has room for expansion. Maybe, in addition to cookies, you could collect some kind of alien-sweet, then trade them to some alien who stays at your ship, and he gives you weapons or upgrades or something in exchange. And if you added more levels, there could be more advanced types of RoboGrandmas, and each different type would have their own dialogue. Maybe there could be a RoboGrandmaCopter or a RoboGrandmaTank.