Machinery makes me think of an old-school RTS game (Red Alert for example, or even Mega Man in another genre), I like how you distributed the instruments on the frequency spectrum, and how your percussive elements come in and out and change ; the overall mix could use more space and stereo though, but nice one.
Relaxing, on the otherside, really fits the other theme of the jam (the lakeside picture), it's more organic, more "alive" and the overall background texture and noises do communicate a feeling of being relaxed, while a tension/a danger/a problem still glooms somewhere.