Like the others said I agree with a bit more bedding if you're able (though 9" is definitely still nice!!) and having a larger sand area. Typically people recommend at least 1/4th of the enclosure being sand for roborovskis but that differs depending on the enclosure. My robo used her sand bath very often.
But I'd also recommend crowding the enclosure up a bit more. Especially in the middle, it feels as if all the items are just around the edges and the middle is kinda a big open space. I'd add some more hides there, maybe grapevine branches, cork logs, etc. Just anything really. Adding in some sprays would also look nice and be a good foraging opportunity.
About the platform, I think it's alright either way. If you wanted to add a platform that would allow you a sandbath on the platform you could do that. Or just a platform for elsewhere stuff. Or again, no platform at all. It's up to you~
Edit: Apparently I can't read and I just read that you already added in the more bedding and sand area, so just ignore that part of my post I suppose :p
Edited by Tater, 13 August 2022 - 09:51 PM.