It's okay
I'm not entirely sure what the Newgrounds Deathmatch is but that aside your song is okay. I think the bass lines you used are really cool and catchy. The main melody doesn't really strike me as something I'd enjoy listening to again. Most of the drums you used are pretty good though with interesting changes to avoid being repetitive. You did a great job of avoiding being repetitive with the whole song really, with constant variations in all instruments.
The slowdown was an interesting idea, and the drums after it were great. With all the small changes I can tell that you put a lot of effort into this, which is good. One thing I can say is the song definitely never gets that stale repetitive sound. Like I said before, I'm really not a fan of the synth you used throughout the entire piece for the main melody, especially not the long notes where it drags out. Idk it just doesn't sound very pleasant to me.
You did a great job with the ending. It really came to a great finish. This is one of those songs that doesn't strike me as a favorite or really speak to me personally but it's still a good tune, and would be perfect for a flash movie or game. I'm giving you a 9/10 just for the sake of effort, and song structure you used here. It's a good piece, keep up the good work.