A fairly simple idea, but it works pretty well, especially after playing a bunch of games where I was the one moving and the things I had to collect didn't move. I particularly like that the things you're trying to avoid are the same as the things you're trying to pick up. And the art looks great and really fits the game: a simple colour palette on a simple game, but the art still looks interesting.
(I think this is the fourth game in this jam where I have to pick up moving things while they're on screen, and compared to those, I think this one has the best or second-best art)
Some music (either some electronic music for the alien aesthetic or some more traditional music that changes depending on which kinds of things the humans are throwing at you) could have made it even better. It seems not every collectable makes the same sound when picked up, so it seems there was some thought put into sound.
After playing for a while, I got back to the main menu (nice that I can get back to that without having to reload the game) and saw the credits screen. The first page maybe shouldn't have had a left arrow to go to the non-existant previous page, and the second page shouldn't have had a right arrow to the "next page", but I don't really think that matters in a game made in a week. Good job!