I downloaded it and am impressed. The game seems to flow well and play well. All I did was play through the first 4 levels against bots which I was able to beat pretty easily, and I though I'd better give some feedback.
The first is that the weapon models needs a little tweaking. The launchers somehow don't look like something capable of firing a fireball. Most of the weapons reminded me of sawn off shotguns, and I think they need to look more varied so that new players will have a better idea what a weapon will do just by looking atthe model.
I thnk the armour it a bit too powerful. Spmetimes I could hit a bot 5-6 times in a row and they'd still not be fragged. This might be because splash dammage is less than i'd expect, but by having armour that's so powerful, it changes a game into a pretty hardcore, control the pickups style game.
The bots seemed to airwalk at times - but I'm no expert animator.
But most importantly the player movement, weapon spread, reload and speed seems right. I'll play some more and let you know what I think.
But the first 30mins of play is important for any game, because many will play or bin after 30 mins or so, so that's why I made this post.