Yes, we also wanted to do an un-queue mechanism, however it is difficult because it conflicts with being able to queue multiple actions on the same tile. Since we wanted a one button system, we left it like this, as it adds something for the player to think about (queue too many and you lose reactivity). However the kill locust action clears the queue to allow you more reactivity. It is not a perfect system, and I'm sure we can improve it, but it was good enough at the time :)
Thank you for playing, glad you liked it!