Dungeon Crawler Carl by Matt Dinniman. Was at the bookstore and browsing around, got the new Grey Man novel and saw this. Cover caught my eye and then read the synopsis... this may be my favorite book ever. I've been dying how funny it is and has a cool premise - earth is "invaded" by aliens one night and anyone caught indoors, or in any kind of structure with a roof, is dead. All buildings and even cars are totally gone. Anybody who was outside has an hour to get into these portals. Carl, our hero, happened to be outside trying to catch his ex-girlfriend's cat. Both end up going into the portal.
Turns out the portals are doors to a dungeon and Carl and Princess Donut are now in an intergalactic Survivor like TV show!
If you like your fantasy/science fiction with a dose of humor, ok - LOTS of humor, this book is for you. Turns out this is a series with 5 books so far in it. I will be getting all the rest.