I've done some thinking. While I do appreciate what the comic has done for me in terms of artistic growth and development of a work ethic, I don't think I really have the drive to continue it after Mission 4. The first chapter is way to rough, the concept wasn't well executed, it doesn't have mass appeal: I find it way to hard to go to a person and say "hey, I have a comic you should read". There's also school work and new projects I want to do.
I will continue on until Mission 4 ends (already have it planned out... with a cliffhanger), and if it does get more popular I just might continue it. Submit chapter 4 to comixology: if they actually put it up in the store I will definitely complete it. Maybe even reboot it in a couple of years. But as for now, Mission 4 will be the last.
I will miss Heavy Mech, and always look back on it fondly. But I have to let go to move on.
After doing another page after this announcement, I have decided to take a ONE MONTH HIATUS in which I will mull over whether or not I will finish Mission 4. I just don't have the drive anymore.