Alex and The Colony by D.S. Samra

Alex has not had good luck with his family.  When they went downtown shopping, he got separated from his mother and no one has seen her since.  Now his father has an infection and there is nothing left to cure it.  He's going to die, too.  But he tells Alex he'll have to take over the colony of people.  He doesn't want to, but he doesn't have much choice.  Climate change has killed many but their colony has survived. Now the weather is storming and there's a huge earthquake...

BooksGoSocial and Net Galley let me read this book for review (thank you).  It has been oublished and you can get a copy now.

When they recover from the storm, they find themselves on a new planet.  The only source of food they've found so far are fish.  They find they are all young adults, no adults made it.  They have lost one young man in the woods already, so they are cautious at gathering food.  Alex leads a group in the woods to hunt and almost becomes another victim.  There's a banshee living in the woods.

Then he gets caught in  a net and is captured by ogres.  They are huge and they like to fight their prisoners.  His little group is the last one to fight. He's taught them to fight together.  He has an elf on his team, as well as a dog he's befriended.  The dwarf is a good fighter.  They manage to win their battle, but they are still prisoners and there will be another harder fight tomorrow.  Then the shaman comes in the night and leads them out and away.  The dwarf takes them through a tunnel in the mountain to where the other humans have been incarcerated.

The elves, gnomes, dwarves, and humans unite but they are going against ogres, goblins, and trolls.   They are bigger so the little guys will have to be smarter.

Alex Finds he's part of a prediction. He's survived so far but he has a long way to go...