A bit simplistic all around, but there's nothing at all 'bad' about this entry. You've got good artwork, solid movement and shooting controls, a good overall concept and core mechanic, and no bugs that I found. It just needs, more. Very nicely done though, really :)

Looking good!

The faster I click the faster they perish. Eat my balls ghost creatures!

Things I liked

• Elegant and consistent art style
• Nice looking UI
• Gameplay worked smoothly with no bugs

Opportunities for improvement

• A single bullet killed multiple enemies, making staying alive a bit too easy.
• After enough waves it gets a bit too repetitive, some enemy variety would be nice.

Simple and elegant pixel art~ perfectly functional gameplay. how is this done in one week?

Interesting concept. I like how you incorporate the theme.