Thanks for the feedback! The game was released in 2012, so it's eight years old now and while there are definitely things I'd change if I were making it now. I'm actually mostly happy with how it controls (at least on a gamepad, not so much on keyboards). To me there is a certain rhythm you get from the two button controls that would be lost if they were split up.
I gave a short talk about my thoughts on the controls back in 2013 if your curious about them (sorry about the audio quality!).
This isn't to say you're wrong to dislike them, more that they were thoughtfully created to a specific, admittedly idiosyncratic taste, and that taste may not be for everyone.
Glad you're enjoying the game for the most part despite disliking the controls!