I'd like to note that the whole idea and graphics are really cool.

But controls should definitely be reworked. I can't finish even first level of campaign, because I'm frustrated that I can't see enemies properly, and I clearly feel it's not my fault as a player.

IMO, this can be fixed by changing camera view to a range: from lower position (classical third person RPG view), where you can see horizon at least to 1/3 of the screen, to almost-RTS view, where you look at your character from above. Also, I'd prefer transiting between this views with mousewheel.

It also feels a bit slow on my Mobility Radeon HD 5450, even on 'fastest' settings, but this is not nearle as severe as camera issues.

Man, it has a lot of potential! Also, lowpoly. I love it!

Hope you can fix these issues to make gameplay a breeze.