Curious, what input device were you playing on (keyboard or gamepad)? If on gamepad, what gamepad were you using? If there’s an issue preventing diagonal movement for some people, I’d like to fix it!
I was only using keyboard. I went back in to test out the input again and strangely enough sometimes it'd work right away, and sometimes it won't especially when starting a level, or when hitting an obstacle like bridge/water, the directional movements doesn't play afterwards.