Halfway is a turn-based sci-fi tactics game in the vein of XCOM, but with a linear storyline tying together its battles and back-at-base sections. Our review called it "almost there, but not quite", because we like to make clever puns based on the names of things. But now you might be able to help get it the rest of the way: the developers have added mod support to the game.
They've created a wiki to support those trying to make mods, and this page has a breakdown of what the tools can and can't do. Can't do: change basic core gameplay; add new skills or attributes "at the moment". Can do: everything else. The list of changeable elements includes tweaking existing skills, plus adding conversations, artwork, characters, levels, AI behaviour, weapons, enemies... seemingly near-everything.
If you're just looking to play other people's creations, there's Steam Workshop support for those who own the game through the service. There's nothing available to play yet, so if you can't wait and need an excuse to re-play the game, the update also comes with an extra "++" hard mode.