Nice idea and style, I couldn't get past the both rooms x) Not enough energy/time to shoot all of them and drain the orbs, and there were some inconsistency of how much energy the doors drained. If you go with the idea of interval spawning and timed orbs, maybe give the player a low energy gain so the player has a chance to fend of the enemies even if he uses his energy badly.
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Nice concept, a bit more feedback of how well you've done so far, like timer. Didn't know I could make diagonals until I read in this section, and confused why only the left pole give power to the house. Maybe give the player a chance to repair poles, and increase the difficulty by ramping up the thunder strikes - I would say this removes the feeling of being cheated on by receiving diagonally struck houses that kills entire lines that can't recover.