Current Steam Midweek Madness for 2$, Plain Sight offer a unique PvP melee battle with 5 different modes
You are a little ninja robot with a katana. Run, Jump, Dash and Destroy is your daily exercise. Kill other bots to gain energy (and points to upgrade some skills) and explode to gain points, more points if you kill someone in the blast.
Free for All Deathmatch
Capture the Flag
Ninja Ninja BotZilla - BotZilla vs All.
Ligthen Up - Tag lightened block with the biggest explosion.
IMHO Missing Modes:
King of the Bots - Keep the king's head as long as possible.