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,

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.

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?...

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