This is a cool tilt to control game (free and without ads) for Android devices
It may seem to be a simple game but its actually quite addicting.

Play Store Link:
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I got the full version for free by providing some suggestions + feedback

You can refer 5 friends to get the pro features for free or by providing feedback or try the promo code given at
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Apparently they had a promo code valid for 100 users, but then extended it to 500, so you could get one too. Good luck