Looking pretty good so far, but there's definitely a few things to work on. The green enemies are too hard, aiming glitched sometimes so you're firing in the wrong direction, and the "extra life points" power-ups are kinda redundant at the moment because there doesn't seem to be a way to recover health. But it's still a pretty entertaining game and I look forward to seeing the finished product.

Thanks for the feed back :D
Looks like I didn't check which version I uploaded yesterday, so some of the bugs should be removed.

How health and heart containers drop should be the way it was intended now (heart containers and hearts are dropped from defeated bosses, can also get health back from zombies but not too common).
All the monsters are still as they were but will see how I could improve them.

The shooting can be a bit tricky to get use to at first, the direction of firing is determined by which direction you are moving in as you start shooting. So if you are walking towards the right then press fire, the direction of fire is to the right. The purpose of this mechanic is to allow you to shoot at enemies while being back to run in any direction.

Just in case I didn't do a good job in describing how shooting works, this video might help explain it much clearer :)