I don't really understand how this game fits the theme.
The gameplay is quite smooth, but it gets quite boring after a while. I didn't even need to use the slowdown ability. Maybe make it so some enemies were so fast that you needed to slow down to take them out. I did see multiple enemy variants, but I don't exactly know what they do.
The graphics are really polished, even for the 9h dev time. The shooting was satifsying.
Good job!