I agree about M and T being a weird choice of controls. In the end the best solution is to eventually add the option to map controls.
However I disagree about the artstyle! I think the cute character and the cute "good" monsters gives the game its personality. It has that "brave kid on an adventure" feel, like some of the Zelda classics (Link to the Past, Ocarina of Time, Wind Waker), or maybe like Undertale.