Nice game idea and beautiful art style! I love the hand drawn artwork a lot!
I'm not so sure about the gameplay. I went to the furnace and powered it fully and won. I saw the spiders but they just stayed away from the furnace. I don't know if they attacked the pylons or not.
With some more polishing and making it clearer what is going on, this could be a nice little game.
For your first completed game you did a great job! Can't wait to see what you will do in other game jams with your hand drawn art!
Well done!