It has noticeable problems, starting with the contrast ratio and a lack of indicators about the behavior of the element (for example: arrows, dots, a label, etc.).
A more comprehensive answer depends on whether you're targeting specific disabilities or full accessibility, and of course user testing. It's not the same to make a site accessible for the visually impaired and for motor disabilities, and we don't know what level of accessibility you're aiming for. In Spain the minimum is AA (I see the app is for Murcia), but for an app about accessibility I'd expect full AAA or at least 80%.
I don't know if you have a plan about accessibility scores you need to reach. If not, I suggest you start with that, and maybe run some automatic testing using tools like WebAIM (it has the WAVE tool for desktop, which is pretty good, but you'll need to convert your app to desktop). This being said, automatic accessibility tools are just a guidance, there's no way to cover all a11y issues automatically.