> I'm just a little confused about what it is.
(note: not connected to developer, but bought the original Eliss on iOS back when it was first released in early 2009. I've never played Infinity, but it looks like an "expanded" and more polished version of the original with more stuff and modes)
The gameplay is actually shown starting at ~00:40. Eliss is very simple when you play it, but confusing to explain/show (it also quickly becomes frantic, and was one of the first good multitouch games[0]).
You get planets and targets.
00:42 planets of the same color can be merged (into a bigger one) by making them overlap
00:45 by putting a planet of the right color and size into a target, you make both planet and target disappear
00:50 you can split a planet in half-size planets by pulling it apart with 2 fingers
01:00 when planets of different colors overlap, they interfere and lose mass (and you lose health)
01:04 apparently there's some sort of planet eating interference I didn't know about
01:08 planets continuously spawn on the field, you get a warning showing the color and size of the arriving planet and should move other colors out of the way fast
01:12 any contact will lead to aggregation, you can clear a field
It's a delightful game with great design and very cute sound effects.
[0] and remains one of the few where you wish you 1. had more fingers 2. had more nimble fingers and 3. had fingers able to go through one another. It remains one of the best and most complete uses of multitouch I've seen.