Looks great, but unfortunately it's not shareware because you don't get to try and see if you like it -- the download page requires you to make a payment before you recieve a download link. You're allowed to pay as little (or as much) as you like, but as a comment below says, "pay before you try it" makes this a commercial product rather than shareware. A mandatory donation is not a donation; it's a price tag.

On a more practical note, how am I supposed to know how much to donate if I haven't ever used it? And if I like it, how likely am I to go back and give addtional money to the author if in the back of my mind is a vague memory that I've "already paid?"

It's nice to see people experimenting with creative payment models, but this one doesn't really make sense.