It reminds me of a flash game I used to play as a kid, called "Wasterlands".The footstep SFX when having no mech perfectly reflects weakness. Though the mechs and energy is being given for free, and the gears that I was collecting didn't seem to do anything. Overall nice game, I reached danger level of 1200
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Thank you for playing!
The gears are used to create a new mech, by delivering the gears to the middle wagon of the train. The big yellow number indicates the number of "scrap" material needed for a new one.
You already did the right thing, since you got new mechs. It was not really explained. We really needed to work on "telling" the player what to do better.