Developing my game after ludum dare - need ideas!

For this ludum dare I finally managed to take the advice to go for a really small scope. And it went pretty great I think. I am happy with the game I made and I had plenty of time for balancing.

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With this in mind, I didn't plan on building on the game after the compo. After all, it was designed to be a small little game to be played by ludum dare participants only. But after reading some comments, there might be some potential in this little game for further development. I just need some ideas on what to implement.

So, if you want, play my game and come with some suggestion on what to add. How can I make more levels? What kinds of weapons could I add that are interesting? More enemy types? Here is the link