I got a lot of notes about this game.

The game kind of throws you in without any explanation as to what button does what, such as the arrow screens. At first when you look at them, they're videos to play? But then when you click on them, they do different things. It seems to me that the first arrow is to start the game, and the double arrow is to continue a previous game, but it doesn't make any of that clear. Maybe it would work better as text buttons next to each other to show all options available?

Also, there seems to be no sound, music or anything, which makes this feel like something is missing. I know on the Hyun's Dojo forums, they have some pretty sick open source soundpacks that you can use without any trouble with copyright, and Kevin Macleod has a bunch of songs that anyone is free to use. Then again, I'm not sure what engine you're using to make this game, so it might be something that just doesn't allow audio.

Just a little note, I've noticed there are a few issues with how the webpage scrolls, like when the comic strip part appears, you need to scroll right to view the whole page, or the obstacles in game extend the page vertically as they go down until they despawn.

I also noticed a lot of inconsistent line thickness (such as comparing the background to the objects in the foreground) and I think it would look better if the thickness was matched up in the middle so there's not such a stark contrast.

I don't mean this to hurt feelings or anything like that. I just think this is a neat idea that could be turned into so much more. The potential shows in its artstyle in the intro. It's really great for what it is. I think you'll get better at making games as you go.

Edit: Alright, so the menu is much better to understand and navigate now, cool! Just remember rest of the issues are still quite apparent. One thing that seems to feel uncomfortable about gameplay that I don't think I covered last time was pressing click while moving the mouse causes you to select the images of the area instead of firing a bullet, so maybe if that can't be fixed I'm sure you can bind it to the spacebar or something instead.
Also switching between tabs causes the enemy rockets to build up and when you come back, there's a line of rockets coming at you.
Anyway, raised my rating from 1.5 to 2. Still think there's more to be fixed, but the fixes already done I think make the game better.