In Backpack Hero, inventory management is the name of the game. All items are held in your backpack, including armor and weapons. They get bonuses depending on what is around them or what else is in your backpack. Leveling up allows you to expand your backpack to hold more stuff.

The gameplay loop is a pretty standard roguelike experience similar to what you see in Slay the Spire.

I will re-review after I play the full release on Nintendo Switch