After news reports about the game, relatives of teacher Victoria Soto, who was killed in the attack, wrote in a tweet to game creator Ryan Jake Lambourn, "Please tell us how playing a game that recreates how Vicki died would be beneficial? Please tell us."
Lambourn defended his game, saying it was meant to promote tough gun control laws.
He said, "Here we are nearly a year after the Sandy Hook shootings in which 26 people were killed and absolutely nothing positive has come out of it."
The Courant writes that Lambourn explains in the game's credits that he grew up in Houston and later moved to Australia, which made sweeping changes to its gun laws after a 2001 massacre there.
Lambourn also created a game about the 2007 Virginia Tech massacre, in which 32 people were killed by a gunman.