I wasn't able to develop much more with the game. Added explosions for the enemy characters. Added a working health bar. The enemies currently take away half of the health, which will be changed later on.
Still to come:
1. Health packs
2. Weapon redesign with upgrades
3. Better looking explosions
4. Increasing difficulty as time passes with more enemies.
5. More levels.
6. Interface for a home page and ease of replaying.
Here's the link to the game on Stencyl's website.