I think your app is definitely appropriate for alloy, the same things appropriate for Titanium in general work with Alloy. One of the key things to think about is that using Alloy will not necessarily speed up development time. That is not the goal, the goal is to separate the concerns (Model View Controller), and provide cross-platform and multiple form factor support. If you are interested purely in speed of development stick with regular Titanium.
However, where it can speed up dev time is in your persistence strategy, sql integration of models is built in with Alloy. So, if this flashcard app your thinking of creating has the users creating flashcards on their phone, then using them later, I would definitely go with Alloy to take advantage of the model stuff.
Take note that the documentation is kind of sparse, I ported an existing clients project to Alloy and really had to find my own way on a lot of things, but It was not a simple app.
Essentially, if you want to 1) Release to multiple platforms and form factors and not have migraines, 2) Have a built-in easy to use persistence strategy, 3) Be able to maintain your code at a later date, or have other people look at it and be able to tell whats going on, then I would definitely use Alloy.
