I tried the game and I'd say it kept me interested enough to try to keep going... and that brings me to my main point. Others probably enjoy the perma-death feature but I despise it. I can't stand rogue. Why should I spend my gaming time making progress only to lose everything if I make a mistake? For me that is neither entertaining nor relaxing -- the reason I play video games. I get it that it is a "challenge" but I don't really play games for that kind of "challenge".
My suggestion: make an optional mode where one can save the game and restart from the last save.
I >really< enjoy Minecraft which has the crafting and exploring aspect which I would like to enjoy in your game -- but I lose interest really fast when I invariably make a mistake and the game forces me to start all over.
One more suggestion: add an invert-y-axis option. I don't know why just about every Unity game lacks that option. If I push my mouse/joystick forward, it is wired into my brain that I go >down<. I have played for years with that option and find it impossible to switch to the opposite. I've managed to cope but only because I die within 10 minutes. If I had to react quickly, I would get confused and most likely die yet again.
To sum up, the game was engaging and interesting but you might consider making the perma-death thing optional in order to appeal to a wider audience.