thank you for the feedback, the game was kinda rushed as our team was kinda all over the place, the way you're meant to obtain more crystals is by mining other things as there is a chance system, however you can also obtain higher tier ones by trading multiple crystals of the lower tier to get a higher one, it mentions this in a tooltip when the player is using the fabricator you press ctrl to make the buttons appear, I understand that the solution I chose the problem was not great as I know now that not everyone is going to read everything on the screen.
After mining about 20 greens gives you enough to trade up for 5 blues to buy a HP scan from the shop which was an indication of how much hp an object has left, this isn't really explained as I had 10min left although I wanted to add more to the players multi-tool tool tip.
Thanks for the amazing feedback and please stay tuned for any updates as I do plan to fix everything you have addressed.