UI/UX check‑up needed: how is this dashboard?

Me and my friend are writing our master thesis on Spine Data and have built an interactive Python Shiny dashboard and we’d love some feedbacks on it's color palette and overall layout/spacing. Also if you could answer these few questions, it would be a big help: https://www.surveymonkey.com/r/SR5KBC7 You can view the dashboard live here: https://app-dashboard-spine-data.cloud.sdu.dk/proxy/8000/