Overall I love the game, and it is especially amazing considering it is your first. I love the concept, and the music is fantastic. The art style is fantastic as well. Also, thank goodness you did webGL.
I do however, feel that the game is too difficult for a jam entry (balancing is hard in a first jam game), the buttons don't fit with the theme of the game (you can change the sprite to just be a square rather than background), the wrapping is kind of disorientating (especially considering the enemy doesn't but their bullets do).
This is just opinion on my part, but the game feels more like it becomes dealing with the orange guys and do the little bit of effort required to avoid the red bullets. I don't even see how this can be fixed.
And looking back at the title I just realized that you capitalized A and I. The A being capitalized is normal, and the just stands out until you realize. Its still a fun little addition.
EDIT: I tried the close button, and you know close doesn't work that good with a game built into the website, right?