I like your suggestion of the care package, we will consider adding something like that. For now, we were thinking of adding random nice travelers who would pass by during the day asking for some special resources, if you have what they want, they will give you other resources.
Once the new weapons, maps, heroes, power-ups, items, and enemies are there, the feeling of progression will last way longer and hopefully, it will feel more like a complete game.
Thanks again for your thoughts, very insightful to read!