Okay, this game has he potential to be something better than what it is. For one, the game feels really floaty. I'm not sure if that's intentional or not. Two, the games has a slightly... off-putting tone. Mostly due to the fact that there was no music. I understand that you addressed this in the artists comments, but it needed to be said. Also, the player is given little to no information regarding what he/she can and cannot do. Now, I can understand why this wasn't included, but still, even if you know for sure people will know how to play, add a tutorial just to be safe. (Make it skippable though!) That's really all I have to complain about. There's no story, but this is a prototype, so it gets a pass.
I need to applaud the graphics. They do look really nice. It makes the game feel more like the 2-D shooter it should be. This really does feel like there's a really solid game in here, that with a little work and effort, could blossom into something beautiful.
This game is a good prototype, but it's just that... a prototype. I look forward to seeing the finish product!