I was under the impression back when Nintendo announced the payment option that it would have been like No Heroes Allowed on Vita. In that game, without paying, you still have access to the full game. The downside is that the pickaxes you use in the game break after so many uses, and you have to wait x amount of real-time hours to get new ones. Among other things that need real-world hours to recharge. The $10 option for the game is essentially you actually buying the game. All usable items are now unlimited, so that they don't break and you have to wait for them to recharge anymore.
I assumed that this game would be like any other freemium runner. You have say, 12 tickets. There are 6 worlds in the game, so... In World 1, all stages take 1 ticket to run. In World 2 they take 2 tickets to run, and so on and so forth. And then you have the option to pay for the game in order to remove tickets altogether and play as much as you want. Clearly, this didn't happen.
And as far as I know, there's not even an endless run mode, which straight-up kills the longevity of the game. You don't make a running game and not include an endless run mode. Lara Croft: Relic Run has a grand total of 80 freakin' stages in the game, and you don't have limited energy or tickets or anything. AND IT HAS AN ENDLESS RUN MODE. And that game is entirely free.
I'm guessing Super Mario Run is a hell of a lot of fun. I'm sure it is and I want to play it. But I really feel Nintendo dropped the ball here. Especially with them not releasing it on Android.