The aesthetics here are incredibly unique. I love the design of the main character and of the strange monsters, and you've done a great job showing Thena's mind-scape. This is a very cool concept, and it could be very interesting as a longer game, since I imagine different people would have different mind-scapes depending on the problems they're experiencing.
As some of the other commenters have said, having to click every time you want to shoot is a little awkward. A key you can hold down would be nice to have. Apart from that, though, the gameplay worked well, and I had no trouble learning the controls.
Well done. This is a very stylish entry.