This movie is amazing. It feels so comforting in many ways. It may be just me feelin this but the setting, the actor & actress (main characters), the soundtrack and even Frodo (the cat) makes this movie so lovingly conforting.
Yes, it's quite disappointing there is no explanation what this creatures/aliens are. I would love another movie for that, we'll get there.
However it does say DAY ONE, so they pretty much made it clear there won't be any some sort of explanation whatever these creatures are. Plus it won't be realistic if they already know what they are or whatever in this movie.
Another thing, Samira (Female Lead) made it clear she will eat that pizza before she dies. So slay girl, she fr reached her goal. Loved her so much for that, of course with the help of an amazing companion: Eric with our brave and behaved Frodo.
This movie gives another perspective how not all have the mindset to save the world, risk myself, save everyone typa mindset. We all have free will, so go ham. You never know when will the world end. Would definitely watch again.