The "file format" of the releases has been updated to HTML5. No they should be viewable on a smartphone screen, due to the appropriate viewport meta information:
<meta name="viewport" content="width=device-width,initial-scale=1"/>
But note that the page layout is currently not so nice in portrait mode.
The Flash based music player – many thanks to Marc Reichelt for his EMFF – has now been replaced by the native HTML5 audio element. The lack of playlist support (so far) is overcompensated by a win of security (because of no Flash anymore).