Finished the game! It was , overall, pretty enjoyable. It took me a while to "aim at the water, though". I had to aim low for the "escape" prompt to come up, while for a while, I was wading through the water, just aiming any which way, almost drowning at times, trying to escape.
Now, while enjoyable, the game was a bit grindy, mainly due to necessity to keep raiding rebel compounds to get the bits needed to craft the engines. Basically, it got repetitive. Also - the skill points necessary to buy crafting skills may be low, or the experience points you get for certain things may be too high. After a while, I just had a ton of unused skill points left over. One thing I realized is that you get the same number of experience points for killing a rabbit, as you do for killing a rebel, which didn't seem all that right to me.
I guess something you'll need to do, if you haven't done so already, is try to decide just what this game is going to be. Is it going to mainly be a FPS? A survival game? A crafting game? Right now, it's trying to be a little bit of all three, and I'm not sure if that's the right approach.
But for an early access game, and a $3 one at that, it was a lot of fun, and I certainly got my money's worth.