Released on; Commodore VIC-20 in 1982.
Text taken from this thread on YakYak.org:
Defenda’s a bit of a dog’s breakfast to be honest. Ship the size of a bus, handling to match and a shedload of bugs. 😀
Sound effects like a bomb in an old washing machine factory. 🙂
Still it was one step on a long road. Things did get better from there on. 🙂