Glad it was helpful! Thanks for sharing some insight into your process.
Things totally change and with a game jam you gotta make those last minute pivots. My feedback about normalizing the movement had more to do with speed increase when moving in a diagonal direction (a common problem in older FPS games) than it did about moving at 45 degree angles, in an isometric fashion.
No reason to apologize either. It's a game jam. It's impressive enough you managed to get it all done in time and on your own. It's still a major accomplishment :D
For a jam it's a bit much to offer reconfigurable controls, as that level of polish is distracts from all the other super important stuff that needs doing. I think your implementation was a great decision to offer alternative controls for the time available.
Would definitely love to play an improved version. Keep up the good work!