So thinking more about the game, the foundation for an actually really great game is there.
And the story and missions would be about the Federation cleaning up the wrecked planets in a post-Phazon galaxy. Planets with invasive species, giant monsters driven mad by Phazon withdrawal, and special Pirate created hybrids that the federation wants for "reasons above your security clearance." It would be co-op and you'd have to travel around these planets and kill or capture the particular animal as per the mission. Sort of full on Monster Hunter. Except the monsters would be insane from Phazon. Or rather a lack of Phazon that they had become fatally addicted to.
The style wouldn't be chibi at all, but rather more based on the actual Prime series.
Battle Ball would be the chibi style or whatever and would be a time wasting multiplayer minigame and have no relevance at all and nobody would care about it. It would be Prime 2 Multiplayer levels of not caring. I would honestly just drop this part and focus entirely on making a neat first person Monster Hunter clone set in the Metroid universe.
Since it's post Phazon, you can visit some of the planets from the Prime games and see what they're like without Pirates or Phazon or anything. You have to hunt stuff like Flaagra spawns or leftover Ing or whatever. Basically play up the Prime nostalgia really heavy.
I think this game needs work.
- The art is kind of boring and very out of style for the Metroid series. It feels like a Nintendo Land minigame, not a Prime spin off. We've had two Prime spinoffs already and they still looked like they belonged in the Metroid universe.
- The world and the new enemies are so generic. Why is the giant monster called "Ice Monster." How can you keep a straight face after fighting Shriekbats and Zoomers and then kill something called "Ice Monster" Yea, no. Develop a world. Retro did all the heavy lifting, take their creatures and run with it. Why is this Ice Monster not some variant of a Sheegoth. Call it "Alpha Sheegoth" and run with that. Retro even had a design for an alpha Sheegoth they never used. Just steal it. Write some lore too. Maybe not a scan visor, but add a bestiary.
- Battleball looks dumb. Just drop it. Like it doesn't need to exist, you already have a multiplayer game, you don't need some side mode nobody will play taking resources from world building and refining the real game.
I hope in the 1 year they have until release they take a good look at what they can do to improve the premise. The idea is there. It can work, I know it can. Exploring creatures and nature in the Metroid series would be awesome. A first person Monster Hunter can be awesome.