Looks like you had some fun with this one! I like the attempt at world building. I got very confused though, after taking the third core I started bursting lightning and couldn't find the fourth one. After roaming around I eventually gave up. I felt like the level was just a bit too large and it's quite frustrating getting shot by an enemy that you can't see, even though I didn't really understand the consequences of losing the grey resource. Having a more elaborate UI could help players with processing your game and focus more on the experience that you wanted them to have.
Good luck!