Liked the game overall. Not very intuitive at first that you need to time the whistle - some visual feedback would be nice. Didn't fully understand why I was not able to build in some places. Great fit for the theme!
Thanks for playing and feedback! In hindsight I should have focused more on the building aspect and made that crisp. I got to hung up in enemy movement and how they effected the playing field. I'll defenitely try to make a bigger game out of it.