Approximately a month ago I had this grinding long-arse meeting such that I should have attended but had no meaningful impact to make. So I run the game.
I played on a touchpad. Its possible, but quite inconvenient. I wish there was some hotkey on the keyboard for firing. Also, it took me more than half an hour to beat the game in this distracted meeting setting. I would suggest adding different modes - with different amount of life hearts and different target scores for those who have less time and endurance.
That said, its a great game. As a person who once tried to create a typing game, I love idea of this one. And it has the feel of completeness. And I like the music (soundtrack) and how it adds to the experience.