Well as for a early access game its a very good game
heres why:
-First of all the game is very addictive once you know how to play you can spend hours on it
-Second this game is the best early access sandbox game for my opnion:build your own ship or plane or whatever you like
with misseles guns lasers and more crazy stuff with a cool battle mode as for an alpha game its very good!
-As well there are few downsides like the game is hard to learn etc... but once you learn it you will be amazed let us dont forget its still early access so you cant expect super amazing tutorials yet you have cool comunity
-Workshop. Well I like the steam workshop on any sandbox game but here its the next level make your own campaign your own battleships realy whatever you think
so as for early access its 9/10 very well done job!