Thanks! The 2nd and 3rd buildings require you to click another building to attach it after placing it, since they act as like a buff. I was short for time on the tutorial considering 2 finals so I couldn't explain it very well, but the basic rundown of them is the overclocker when attached to another building makes it considerably faster at a cost of less HP. The cooler is a basic healer, when attached providing +1 HP per second. Thank you for the feedback though, I really appreciate it!