Not very good
There are simply too many other shooting games here on newgrounds, which aren't very violent either, to make this one of them.
But it seems like the game mechanics work alright.
I would suggest you to improve the music, cause it is very worn. Maybe change it to something more fun, cause this one is reaaaally boring :) And if you could add a "slimy" sound effect when you kill a slime, it would be cool too.
The animations are alright, but the drawings are simply too simple. Especially the background. And the cutscenes with no sound is just too boring and fast.
I would highly recommend a "hiding spot" for you to go and reload, cause it really don't work for me with the 5-shot then reload thing. Especially vs the Golem.
And why does the health bar has colors, if it just shrinks when you lose health?
Make bars disappear instead, so you can see how many times to can get hit before losing. And maybe add items to pickup from slimes when die. An orb of life, or maybe faster reload orb or something?
All in all this game doesn't make much sense, and the graphics aren't good, and the game itself is not very fun to play unless you improve a lot of things. I hope you can use some of my suggestions, and I will look forward to kill cute slimes in a new optimized version of it :)
-Manhart