Not sure about planets in the sky unless they all are supposed to orbiting each other. Having them still look that big otherwise is just too big a break from reality (since objects that massive couldn't get so close without gravity going the rest of the way). The real gotcha here is people don't have to think of something that complicated to realize something's wrong -- they only have to think of how big the planets look in our sky. Or, heck, the moon, 'cause it looks smaller from here than what you've got in those drawings.
And once you think of that you can't unthink it of... you... anyway, there would need to be some kind of sufficient justification written in for how they get to be so close to each other. And it would need to be sufficiently available to intelligent animals who do have that thought go through their heads (or wherever else they may keep their minds) when they see those big balls in the sky during gameplay. If you were able to come up with both of those things, then it just might work.
Otherwise people who don't read the lore too closely (which will be many people) will assume these are all moons (or all but one of them are, anyway). And if they do read the lore closely they'll think you're crazy.