As a concept , I like it and believe if executed correctly could be massive, something like this has the potential to be the vehicle to onboard users into crypto easily and simply.
The brand imagary is colourful charming, fun and will be maintained into the app, which should appeal on a visual level to users.
As apps are updateable so new content can be added over time, like a release to include any future wonderland seasons, so the future possiblities are infinate
.
A few other thoughts 
Does any of the team have any prior experience of developing and delivering apps, I say this as this will be one of our flagship onboarding products, it has to be seemless and flawless come general release. An IOS app is a must, and if i understand correctly needs its own xcode/IDE code, and probably need several approvals covering various regions, so potentially brings it own complications.
Security, with the amount of scams within crypto even with the tightest of wallet control and security, some of the best and most experianced users can still get caught out and loose funds to them, one of my concerns at moment (not specific to this or Sanctum) is all current craze for linking wallets for various purposes, because if the profile or account gets hacked they now have access to all the linked wallets. If the app is to be “walletless” for want of better term then it needs to be bulletproof, multi-layer security, new users could easily mistake a scam email relating to their account and be taken in.
Initial timescale, how long are we estimating for an intial period to have something to show for the developement, again I ask this no small undertaking to acheieve major apps have whole teams dedicated to the development and upkeep of their apps, product update releases, bug fixes, security patches and so forth.
Still thinking, sure there will be more thoughts and suggestions over the next few days