if you have a problem to select an enemy from the back row, try selecting the enemy before it an press up button on your keyboard. + so everybody can see it.
About elevators: just build them in snake-style, each one for 5-10 flours. They stop complaining about line as each elevator moves quickly. Press + if this method helps you.
controls are buggy as hell, sometimes it just ignores the keyboard for a few secs, sometimes it continues running when you press nothing. Extremely annoying, 1/5
Well, thank you! Did we mention we love you for these kind of comments :D