I've changed the official page to no longer display the pricing information or link to the order form. The page was created based on a template I had and many people thought it showed arrogance and hubris to display that information before the game was actually available for sale or even appealing enough to be bought.
The next version (0.6.0) ...
...has smaller collision boundaries on the players' ships
...has a playing area with a 3/4 ratio traditional to shmups instead of the 4/3 ratio traditional with standard windows sizes. Black bars will be drawn down the sides, tho i might fill 'em with stats & pleasant background animations that fit the theme.
...has a full 3 minute level with a boss that shoots a variety of fire patterns, each with distinct shape, size, and color. The boss will have hit regions that need to be destroyed before the boss proper will die and at the moment of death with trigger the end-of-level sequence. (At present killing the purple miniboss does not trigger this sequence, leaving you flying in nothing forever)
...will be released very soon (within about a week, I hope)
A few people are apparently very turned off by the placeholder art. I don't want any more people to get a bad first impression based on unfinished art so version 0.7.0 will have added focus on making the game more "edgy".
The game is already designed so that two players can play side by side. A goal for the not-too-distant future is to add networking - starting with global & continental rankings and later adding networked play (if there is sufficient demand).
Another goal is to finish the OSX port. Unfortunately my linux box does not support tunneling so I cannot use PearPC to test in an emulated environment. I hope to resolve this problem sometime soon.
Once again, thank you to everyone who's given some constructive feedback. It really helps eliminate doubt in my mind about which way to proceed and that makes developing the game that much easier. If you haven't tried it yet, please do. If you have anything else to suggest, well, you know I'm listening

Cheers!