Zombotron 1 does not feature any melee weapons, but the zombies and robots use melle attacks.
In Zombotron 2 the player can also use melee weapons, with the sword in level 3. Pick axes and shovels are also available.
Zombotron: Time Machine
In Zombotron: Time Machine you start off with the wrench as a melee weapon. You can get the same melee weapons from Zombotron 2. In certain missions your friend Fina will use her AK-47 as a melee weapon.