I've managed to beat the easy level, here are my thoughts:
1. Art is done well, fits together with music
2. The game seems to be quite difficult at start, but once you get a grasp of it it is balanced very well
3. I loved the visual indicators, I could easily see where I'm getting shot - but I think it's very difficult to dodge those bullets, most of the time it felt like I had to be lucky not to be hit
4. Controls are simple and done very well. I usually dislike these types of controls but here it was fine for me
5. Tutorial section is done nicely, I understood what to do
6. Goose