Gun of Icarus Alliance, a game some of us have played on rare occasion, is available free for the next day on Humble Bundle, link below. Note there is some questionable content in the Icarus game store, so I wouldn't buy from it, but nothing in the game itself as far as I know.
https://www.humblebundle.com/store/..._layout_index_1_layout_type_twos_tile_index_1
https://www.humblebundle.com/store/..._layout_index_1_layout_type_twos_tile_index_1