saw your comment on the ldjam site. Relax. Many first games are not that good. You're brave enough to submit for Ludum Dare 45. I didn't even finish mine.
Some areas for improvement for this game:
1. The soldier can't shoot. People don't like that, because they have no control and cant fight back
2. Nothing happens when his health drops to zero. He doesn't even die. You can show a different sprite or go to a "GAME OVER" screen.
3. What's nice is that you had different barrel designs, and you spent time drawing the soldier. Good job!