Andromeda is a free MMO space planetary empire building game. It's a bit like a mix between a Tycoon game, a 4X game and EVE. It's developed by one person and designed to be as non-pay-to-win as possible. It's available for free on Google Play and Steam.
Orb of the Gods is a roll-a-ball castle destruction game with a twist. Take control of an Orb with the power of an ancient god and unleash overpowered abilites on castle walls made of thousands of individual blocks. More destruction = more points. Scores are uploaded to an online leaderboard so you can compete with your friends and the rest of the world. Smashy Castle is available for free on Google Play.