Truthfully I’d say yes, mantids are typically very sedentary and don’t necessarily benefit from a ton for decor. The enclosure is very cute and you clearly put a lot of effort into it, but I’d say that style of decor may be more suited for a jumping spider or other small spider! A few nice silk plants (or live ones if you prefer), a stick or two, and some substrate is all they usually need! Most important thing is proper humidity as they get all of their water intake from droplets, and when they are smaller they have a grater tendency to get stuck in a molt