It being in Early Access shouldn't be a concern as long as you think it is worth the money NOW.
It is fairly cheap ($20) and has quite a bit of content and replay-ability. The narrator is absolutely fantastic and while there is a strong prodding by the game to play with high light, there are benefits to not playing with high light.
This provides a lot of diversity in the way the game is played.
In addition, even though the game is rather dark (ha) at times, it has some small comedic elements that really further enjoyment.