Here's some things I'd want to see happen:

• Party System: Bringing in up to 3 more dogs to help in the Sorties. The dog's arsenal could perhaps be customized too, or the player could bring in a NPC Dog that would have its stats and arsenal based on player's average.

• Multiplayer. Perhaps both Local and Online, up to 4 players. May be a good idea to make drops instanced, so the players don't compete for a drop, but rather everyone gets it all.

• Related to the above, the bigger the party, the harder it gets. 2 Dogs causes difficulty to go up 50%, 3 Dogs brings it up to 100%, 4 Dogs brings it up to 200% (So to say: 1.5x, 2x, 3x), and likewise improves the drop rates

• Have default level cap be 100 and can be increased by 10 with Level Metafin. Maybe it should be a very rare drop from final boss and EX Sorties.

• Add other shelters/villages to visit and NPCs to interact with, perhaps to create the impression that the world is healing as you progress through the sorties and provide different shops.

• Have different dogs have more specific perks, like let's say... One could have the ability to fire two or weapons of the same type at once; another could get the ability to dodge into enemies to damage them proportionally to Max HP; one other could get only one weapon slot but carry way more ammunition and have a larger magazine.