Good for you. Always nice to spend some time shooting air guns and, as you probably discovered, that "just one more shot" thing is hard to resist. Don't worry too much about your shooting. The idea of shooting air guns is to have fun and it's sounds like you did. Those orange-red squirrels were probably Fox squirrels. They do get quite a bit larger than Gray squirrels. Hunted them quite a bit in my younger days, often with a Sheridan Blue Streak.
Spark Master: amusing video, shame it's three years old, otherwise I mighta donated to the startup and tried the sausage...I wonder how much nutria those guys have left?
Trust me on this one. If you plan to eat squirrel, do not shoot the old ones. When my bother and I were kids, we shot an old white at the muzzle Fox squirrel with our Sheridan. The old guy was huge, the biggest we had ever seen. We decided, right then and there, to play pioneer and cook that squirrel over an open fire on the spot by skewering on a stick. Well, we'd have had better luck chewing a truck tire inner tube. Great memory, though. One I'll never forget. On the other hand, have cooked many a squirrel when camping by quartering them, then wrapping them in aluminum foil filled with barbecue sauce, burying in hot coals and letting them as long as needed. Makes for very tender eating.