L!ght Delux is a simple, grid-based puzzle game that uses a laser metaphor. In each level, you have to get light from one or more emitters to one or more targets. Light can be reflected, broken into colors with prisms, have color inverted with color-changing lenses, and so on. In addition, there's a Sokoban-like element; some items on the grid are in fixed positions, while others can move but, as on ice, moving something moves it as far as it can go in the direction of motion until it runs into something. Thus, solving a puzzle both involves figuring out how to use the level's elements to get the correct light into the correct receptors, but also solving the motion puzzle of getting everything where it should be -- and getting light-blocking obstacles out of the way.
The level design is quite good; they start off simple, difficulty ramps up pretty smoothly, and some are quite tough. The demo has 17 levels -- a bit scant, I think -- though there are 100 in the full game (at $10), and there's also a level-builder and the ability to play user-supplied levels.
Stark but attractive graphics with occasional particle effects for rewards, plus a nice light jazz soundtrack, a musical style you don't often see in games. I think it's pretty cool.