The best alternatives to Metric are Scratch, Space Shake!, and Element. If these 3 options don't work for you, we've listed a few more alternatives below.
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Scratch is a high-level, block-based visual programming language and website aimed primarily at children as an educational tool, with a target audience of ages 8 to 16. Users on the site can create projects on the website using a block-like interface for free.
The fate of humanity lies in your hands in search of a renewable energy source. Try to stay alive and avoid obstacles by tapping to ascend and releasing to descend. Avoid asteroids and floating skyscrapers at all costs.