What am I missing here? His claw attack is unavoidable and it takes forever to charge a slam... Help?

interesting concept hampered by the atrocious input lag, and gimmicky npc encounters,

When I first started up the game before, it was shown that I can use keyboard to press start. Now every time I start up the game it requires me to press the A button which is from a controller which is not connected. Which brings me to the problem that I couldn't start up my game any help?...

I bought this last night on a whim, was having a lot of fun with it in the first level. then got to the boss fight. why not use your games CORE MECHANICS in the boss fight? instant buzzkill.

They throw two disks and if you dodge one to throw it back I just get hit by the second one. Am I missing a mechanic? Thanks