According to the game's official Steam description,

Get ready to unleash your inner bear in Bears In Space, the over-the-top bullet-hell first-person shooter that’s bound to have you ROARING with excitement! Dive headfirst into hordes of oil-thirsty robots as you embody Maxwell Atoms, a Spacetronaut turned extraterrestrial castaway, whose DNA has been merged with Beartana, the She-Bear.

Embark on a zany and humorous out-of-this-world adventure that’ll have you blasting your way across exciting and varied locations, from wastelands to space carnivals to ancient hidden temples and more as you quest to find your way back to earth and if there’s time, save your crew.