I just retried it, and I felt the controls were already a lot more usable. Either the update to the jump had a good effect, or it is just me being properly awake this time around. I still have a bit of an issue with the jump, but I can't pinpoint it.
When I originally referenced the jumps floatieness I think I was referring to how you speed up and slow down. Though I am no longer of that impression.
About the keybindings, yeah rebindeable is the best. But when writing that I was also under the assumption that using arrow keys was more common, but after playing some more titles I've found enough games that do it the same way that I am now searching for a quick key remapper. There's just too many games here that don't have the time to implement a remapper and too many that disagree with me on optimal keybindings, so I should find a workaround on my side.