With Beatdown Brawler about 40 days from release we've added details on the games Controls and Game Modes to the discussion forums and are duplicating them here to get some additional information out to the public and to beta testers.
Controls
Attack - Left Mouse / E / Gamepad A
Avoid/Dash - Left Shift / Gamepad Left Shoulder
Block - Middle Mouse / F / Gamepad Left Trigger
Kick - Right Mouse / Q / Gamepad X (Left Button)
Grapple - C or Special + Heavy
Focus on Target - T
Roll - Space / Gamepad Y
Jump - Roll (Space / Gamepad Y) + Special
Select Target - R - / Gamepad B
Toggle Special - X - Gamepad Right Shoulder
Toggle Heavy - Z - Gamepad Right Shoulder
Special Ability 1 - 1 or Special + Punch
Special Abilility 2 - 2 or Special + Kick
Rotate Camera - Mouse / Gamepad Right Thumbstick
Movement - W,A,S,D / Gamepad Left Thumbstick
Pause - Escape / Gamepad Special Right
Hide UI - Alt-U
Additional Control Related Notes
Game Modes
Traditional - This is default game mode. Your objective is to survive waves of enemies and then defeat the boss. The level will end when the boss is defeated.
Survival - You will play on a single level with a never ending supply of enemies and periodic bosses. Spawns will come more quickly, and enemies will scale in difficulty over time. Your goal is to survive as long as possible.
Rhythm - In Rhythm mode your goal on each level is to survive until the song ends, while also defeating a quota of enemies and a boss who will spawn later during the song. Performing attacks, dodges, blocks, on beat will reward Chi and do full damage, while using actions off beat will reduce Chi and do partial damage. Hit lands are timed to occur on beat and heavy attacks are disabled.