I loved this game and I can't wait to see it develop into an incredible game! Keep up the good work guys!

i am not sure if there IS a use for them yet I've tried everything but yet when you go it to sandbox mode you can make shield rims, thrashers etc. so i am totally not sure....

Crystals are implemented in-game but they doesn't have any use (except for visual for 2 of them)

They will be used later, in 0.1.2 as you can see on his trello page

HIs Trello