I had a quick go yesterday. I have to say the game is not user-friendly. Most menus are hard to get or to understand the purpose of. Single player is also impossible past the second wave unless I'm missing something, how are you meant to deal with waves from all sides + bomber that charge at you all by yoursef?
I have to say though that the avatar creation is amazing, best one I've ever experienced.
I think it'd be fine if the beta was the first few hours or something of the game i.e. where it actually introduces you to all the mechanics. Instead, it just drops you right into the middle, where a lot of mechanics are unlocked, so you have a
ton of stuff to work with, which makes it pretty overwhelming.
I found the menus to be a major pain in the ass when I first started playing this demo, but after putting in a few hours - everything is surprisingly clear and detailed. Easy to tell the important information, access crafting requirements, upgrades etc.
Same goes for the difficulty - at the point we're at in the demo, in the full game we'd already know the basics of the game, how to make use of what we build and whatnot.
The first few times I tried playing the Easy mission on solo - I couldn't beat the first wave. Afterwards I played a bit via matchmaking, which helped me fill up my resources and get the hang of the building & melee combat.
Now I'm at a point where I can solo the Lvl20 Normal mission if I put in the effort and it's a helluva lot more fun than it was when I first loaded this up!
I suggest trying out quick match, to play with other people, till you feel confident in taking up the first mission by yourself.