Fantastic. Time bomb areas required a little too much trial and error but once I understood the concept it was just fine tuning. Five stars. Can't wait for badges.
Grudgingly scored a 4. Good concept and generally good execution. Glitched final gun is bad, but it's not necessary anyway. Also, standard size on the screen is basically unreadable for the majority of text. Needs a better font selection. Still fun and engaging despite the flaws.
Needs an undo button. Sometimes I click on the wrong square and follow through with the logic. Then I have to figure out where I screwed up and erase the whole area. Be better if I could just back up my progress to see what went wrong.