I must admit I find this game difficult and yet... relaxing?
Haven't played No Man's Sky for myself but I've seen the gameplay and heard and were pointed out how disappointing it turned out to be.
You, however, created a game comparable close or even better than the original. Thus you deserve more than five stars but sadly that is all I can give to you.
Damn, if I could I'd like to drink a beer with you...
Keep it up!