Download Endless Space
The game is pretty much similar to other space games. You fly on a space vehicle and search for other planets. You are in search of materials, although you can gain scores and land on other planets by fighting with other ships. According to the story there was war and you are building an army by collecting materials from everywhere. You use your ship to find materials and gain scores. This is a good rpg game.
You can download the complete version for free and play it without any limitations. It is free from ads and any in built installer program.