This is stinkin awesome to play. More awesome considering its the product of a single week. In case anyone is continuing this development (I remember something about the source code being released) Let's talk about how it can be tweaked.

Here's my list:
-Marines remaining count. Nuff said.
-Maps (I'm sure that's pretty obvious)
-Less chance of sentries and mines. When you have something like 6 sentries in a spot that's not easy to bile, things die.
-Perhaps less ammo and health. Or else, less in a single area, more of it spread out.

This isn't a tweak but I'll toss it out there. I'd presonally like to see longer matches with an upgrade style similar to the combat mod for aliens. Instead of points per kill, maybe as time progresses more upgrades get unlocked to choose from.

I also had the idea of a more wave based approach, where there's a finite number of alien spawns per wave, so it's less of a time based thing and more of a bunker down and defend type thing. Every wave the alien spawns increase and the chance of higher lifeform increases. (e.g. Wave 1 is skulks and a few gorges; 2 gets a couple lerks mixed in; 3 gets more lerks and maybe a fade or two; 4th gets more fades and maybe an onos; 5th and last is several onos (not at the same time though; or something along those lines). In this case the marines might need a bit of a buff in armor and health.

Anyhow, there's my thoughts, discuss! And awesome work creators.