Don't count yourself out just yet dude. One important area in which you have a leg up is in creating a distinct mood and atmosphere in each of your pieces. This may be especially important in the context of newgrounds, where the general idea is that we're creating audio for media. Your piece does a really good job of invoking the feeling of running through an intense dungeon a la Binding of Isaac or something like it.
Guitars sound great, and I'd venture a guess I'd have little to teach/suggest in that arena. I can, however, give you some pointers drum wise that I think will help your sound without too much extra effort. The drums are programmed well, and I rather like the mix approach where the snare is warm (toms, too) and slightly dampened, which gives them a more modern-analog sound like from a Baroness or The Sword record. In keeping with that tone, try cutting a tad bit of the high end off the kick and adding some dynamics in. A lot of metal dudes may scoff at that suggestion, given that the boilerplate sound of the genre these days is clickier than a tap dance routine and the only note velocity is 127, but it will yield a much more convincing (and pleasing, imho) sound. Also, don't forget to use some reverb and room mic, even if it's light. Drums are almost always heard in an acoustic space, and that space usually imparts a significant degree of character, unless we're talking about a super-dampened, almost anechoic room or wide open outdoors. Easy to overlook when using Addictive or EZD (sounds like one of those two, anyhow) where you can cut the bleed out of everything and disregard the room. This makes the kit's elements super isolated from one another and easier to set levels, but the price tag is in losing some realism.
Good luck, man! Your track kills.