It's a nice game but I have some feedback:
The first two levels want you to click the non-misleading option and then the third requires you to click the misleading option, which then has a "Report as Deceptive Marketing" button. This feels counterproductive if you're trying to teach people to not fall for dark patterns, you've just rewarded them for falling for it and punished anyone who didn't!. Then, a later level has the opposite, you see (almost) the same dialog from level 3, but you need to click the other option.
The instructions for Level 3 do say you're supposed to "find the hidden truth", but that's not necessarily what clicking the "Activate Premium Features" button would do in real life. I think it would work better if it stuck to one side of things, probably having players always try to avoid getting misled. At the end it says one of the outcomes should be "Improved muscle memory", so the goal should probably be no clicking on bad things.
This also makes it confusing what it's supposed to be simulating to me. I've never had a site offer to let me report their own promotions as deceptive (or as a later level has, "Report Bait and Switch Tactic" when you go to check out).
The "Trick Questions" level had only pre-checked checkboxes that you should uncheck (and the button tells you to uncheck all of them, there's no thought required here), I think it would work better if some needed to remain checked. It ties in to the same "muscle memory" issue, unchecking isn't guaranteed to be a good action. Similarly, it might make sense to have Basket Sneaking include a coupon code or something that you shouldn't remove from your cart, so players learn to read closely.