My wife was annoyed at not having released a game for almost a year and she set a hard deadline with the smallest game idea she could think of. It became fun when the game became playable and if we had to do it again, we'd focus on getting to that stage much earlier. The game was finished before the deadline, so we even had time to polish, balance the game mechanics against each other and add a touch interface for the Android release that never happened, but made it into the source code DLC anyway. Previously, we had spent way too much time switching back and forth between Unreal Engine and Godot, not being able to decide or finish anything. Kicking each other's behind to finally get it done also helped a lot.