I would have preferred an option. The original legit has bad controls IMO, the biggest weakness of this version is its adherence to the original in controls. That said, it actually adds extra animation as 'tells' on the slipperiness.
Yeah, I guess an option for refined controls would have been an okay compromise.
It's funny, I'm very certain the prequel Wonder Boy in Monster Land (Arcade) didn't have such slippery controls, you would be slow but getting gear would make you faster but you'd only be slippery on ice.