Some feedback on the release trailer from a friend whom I know is the type to love this kind of hard Sci-Fi stuff:
Ice caves lijkt interessant maar die trailer laat te weinig gameplay zien om echt iets over te kunnen zeggen. Ik hou mijn oren open.
Translation:
Ice caves looks interesting but that trailer shows too little gameplay to really say anything meaningful about it. I'll keep my ears open
I sent him the 3 minute version and the 30 min long play, and the reviews. Sadly, it turns out his gaming Achilles heel is momentum-based gameplay - "Oh god, Lunar Lander PTSD"
He might forward it to some of his friends that he thinks are into it though
Either way, maybe link the gameplay trailer from the release trailer page? And make a slightly longer one that combines elements of both to pin it in your Twitter feed and such? Just trying to help optimize your marketing a bit (not that I'm a marketer myself)