I tried out NeuraQuarium lately and I have to say i'm a little disappointed with the modern gaming industry way of being forced to pay your way into alpha testing. Thanks for staying free.
I think the temperature system in that is fascinating, though, as well as the way that creatures do not explicitly recognize objects in the game world, only color and smell. I think it could be neat for The Bibites to expand in that direction.
I also like the way that instead of a "void" or a "magic forcefield" there's just a rock barrier that deals adjustable damage, makes it feel more like an underwater alcove and encourages hazard avoidance better