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. Orb of the Gods is available for free on Google Play.
Starheim is an always online multiplayer spaceship flying looter shooter in development for Android, iOS and Steam. Zip around in your spaceship and blow up tons of enemy ships with elemental based weapons. Counter the element of enemy shields for maximum damage, for example Water element attacks deal additional damage to Fire shields. Collect loot from downed enemy ships to upgrade and outfit your own ship to be able to take on stronger regions of space. Compete and fight against players, or team up with them in parties and guilds.