Astraware is well known in the handheld world for producing some really visually stunning games, especially considering the limitations of the hardware (320x320 screens, 16 bit colour, etc). Two of my favourites are Bejeweled/Bejeweled2 and now I have Glyph to add to that as well.
Anyone who's played Bejeweled before won't have a hard time figuring out Glyph. Like Bejeweled, the object is to match 3 or more crystals of the same colour to clear them of the board. The difference is that Glyph has a story behind it. By removing the crystals, you uncover various elemental symbols (glyphs) which you need to piece together to save the world of Kuros. There's a different pattern for each level and different challenges. Helpful artifacts such as items that convert all the crystals to a single type, eliminate entire rows or columns or of a single type pop up now and then to help you along the way. After unconvering 4 glyphs, you have to 'reassemble' the glyphs by replaying a pattern of tunes 2 or 3 times, very much like playing the old Simon game.
Like Bejeweled, it can be surprisingly addictive and fun to play. It's got a nice little soundtrack of soothing electronic music playing in the background that can be muted for more discrete playing. Like most of Astraware's offerings, the graphics are very nice and continues Astraware's tradition of bringing high quality game to the Palm platform.
So far the only downside I've encountered is that the crystals are all on the small side, so you tend to get a bit of eyestrain after playing for a while.