Bright memory could definitely become a AAA mobile game. It has been a couple years I've heard about this game and I've just only managed to try it thanks to TapTap.
The graphics are top tier, the concept/story of the game also seems interesting. The game for me sits at a 4/5 because there are a few things that the developers could fix to make this game sharper and more addictive.
Forts they can make the graphics more stable, the graphics are so sharp that sometimes when there's a lot of movement happening it looks messy and distorted. Also, sometimes the enemies movement doesn't make sense but I would also relate to how high the graphics are, it makes the game feel unrealistic.
Overall, this game is amazing. I also had the opportunity to try it with my Kishi Razer and I was upset that it was just a demo/early access. Hopefully the company do sharpen th game a bit more and they actually release the whole game! I'll definitely be on the look out for this game!