I've just started playing, and these are my suggestions as a new player.
Having the controls listed in readme is great, but a tutorial or more onscreen assistance would be beneficial. I have died each time while trying to figure out what I am supposed to do next. I'm sure it isn't that hard to figure out, but as has been the case with games int he past, many people will tend to lose interest early on and downrate a game. In addition to the tutorial, something of a backstory is also a nicety, but not necessarily needed.
Like many others, I would love a co-op or multiplayer, but understand the need to perfect the base game first. I look forward to multi eventually (outside of mod), but look forward more to the development of the game at hand first.
So far I like the idea. Just need to get the idea of what to do without having to watch youtube videos.