Here is some feedback:
Blue links on a dark blue background is not ok, hardly readable for most
people, and it can even be an accessibility problem for people with
various vision problem.
+1 to this. Even a large plain text link that appears normal is better than a button styled this way.
Other feedback:
The placement of the guiders seems to jump around a lot needlessly. They are often pointing at elements unrelated to the tour contents, for example, at the first "Let's get started" step, it seems to point at the Wikipedia logo for some reason. Pointing at a particular element should ideally only be used when you want the user to interact with that element in some way. If you don't need to point at a particular element on the page, then I believe it's fairly trivial to have the guider be center-aligned and without an arrow.
The button is often the title of the next guider. For example, on the step introducing Wikipedia's mission statement, the button is "It is happening". You should never expect users to actually read all of the guider content line by line before responding the button, and instead expect them to scan.[1]
The button should almost always be an action verb, e.g. next, learn more, let's go, get started, etc., though the question form probably works too (e.g. "Who writes Wikipedia?)
If I click the "Explore more motivations" button, the page just reloads and the same guider seems to appear over and over, leaving me feeling stuck.
I didn't really understand what I was being asked to choose from or why at Wikipedia:TWA/1/Bio
Wikipedia:TWA/1/Reasons -- you and Maryana and I should talk about the content in this step I think. The list of motivations we developed through interviews still holds I think, but just presenting the motivations without context or examples may not make sense to a lot of people, because many of these are intrinsic motivators. We also named a lot of these in ways that may not sound like benefits or be really appealing to people. Terms like autonomy, perfectionism, curiosity are really more attributes of Wikipedians, not ways to describe why contribute is rewarding. I'd probably keep this list in mind, but rewrite it to focus on describing benefits of contributing in plainer terminology.