This game as it is has a pretty good visuals and SFX! That's the first stuff u notice when starting any game. So, devs nailed this part! Plotwise (A little SPOILER alert, I guess) Into the Unknown has a good twist that could've a better explained ending (I got only one for now). Or, this fact can be used as a binding point to the next part of a game.
Into the Unknown contains a monster that has a weakness that makes monster useless. Maybe, I wasn't paying attention to something and ran through the game too fast to experience the hard time.
All in all, I'm happy to find this little indie project! It's not Dark Souls, so it's not supposed to be hard. It's all about journey that Into the Unknown has to offer.
Have a nice time playing! :D
Did a video on this game, so u can see reaction to certain parts of it, if u're interested