Well, in this case, I'd be going by previous releases. It's a flash game, first and foremost.
And the original was released on PSP as a "PSP Mini", which is essentially PSP's equivalent to DSiWare titles.
So I was actually surprised this was a retail game.
It's also not really a sidescroller, at all. I think the view is just zoomed in compared to the older games.
You do platforming, but if it's anything like the previous titles, you're in a large square room and have to go through doors by flipping around. It's not like you're going through worlds or anything. It's mostly puzzle rooms, like Portal, but on a smaller scale.
It's very similar to titles that are on DSiWare I think and really, I can't imagine that they came up with enough stuff to justify a $40 retail release, but I guess we'll see. If the PSP Mini version is anything to go by, I don't really see that being possible. You can finish it in a day with like 100 or so puzzles.