It's definitely quite impressive for a 2 day jam, though the game is held back by some elements;
Performance is quite bad, seemingly due to the web build? Next time I'd advise making a standalone build just in case, also maybe look into light baking and occlusion culling if you havent as it seems you didn't use any (could be wrong tho!)
Also, there are some affordance problems; the buttons especially don't really look like buttons so an easy fix would be to have them glow like the energy sources, so that the player can follow the basic rule of glow = important