Thanks for your suggestions!
- The next update will most likely be focused on multiplayer. This means that I probably won't be working on other new features until that part is done.
- Weapon customization and skins are a possible addition, but they would require a lot of work, so it would take a while until we see them done.
- Payload mode is very unfitting for a game like this; it requires maps especially built and thought-out for this specific purpose. I don't plan on adding this feature, though I might reconsider in the future.
- Minigun is among the additions I intend to work on.
By the way, please prefer to write a single cumulative comment rather than multiple comments one after the other, it tends to create some confusion :)