I like the boss nerf on easy, and I really dislike the new room 25 (really I think the first shift+A jump that needs to be executed fairly quickly is fairly cheap; the later pair of new shift+A jumps is much more reasonable.)
It's an OK game. Two complaints
1. It feels like there is a memory leak floating around.
2. I really with there was some ability to rotate the playing field.
Killing things with your shield gives a ton of lag: enough so that I don't think the kill 10 things with one shielding award is possibility without a fix.
There are serious issues with this game. Maybe it's just because I'm playing on a mac, but the load time between stages is ridiculous. It's also stupid that the left mouse button both starts a stage and causes the ball to jump.
While this is a good game, there needs to be something done about being able to fly infinitely long distances. A return to the menu button would be nice also.