Wow! I can't believe you were able to do an RTS in a game jam! I especially appreciate the multiple camera binds (as someone whose middle click isn't working). On a side note, the instructions for left vs right click are inverted for me, which should be correct and in line with other RTSs (left to select, right to move).
I liked your use of duality with 2 different unit types both managing the same resource. Combining them for high unit production becomes a natural progression and is a cool use of the mechanics.
Music choice was solid, I liked the polygonal art style, very TRON.
Some ideas for improvement.
Polish (duh). Theres some bugginess with the pathfinding, spreading out units when they walk, having a quick way to select different types, etc. Not really a valid complaint given its a jam game, but I thought I'd mention it.
The crystals weakening the void felt pretty unintuitive. I had a hard time grasping how they were actually affected (I think they have less hp or something?)
I think another cool idea would be to mirror the duality of your units in the void somehow. Lots of ways to got about this but its hard to go wrong increasing the enemy variety. I also wish there was a bit more time at the beginning to make plans before they immediately begin knocking on your front door.
All that said, really great job creating something of this caliber for the jam!