Characters will remain 2D sprites , I'm having fun modeling various props in 3D but characters are way beyond me, I think sprites still look neat and thanks to the isometric perspective I can reuse the same ones

Hopefully the added vertical component makes for more interesting levels, I already started finding interesting ways to add secrets, things like jumping off a walkway onto a pipeline leading into a opening km the wall with ammo and weapons.
Movement should be pretty much the same as the 2D version, the isometric view pretty much handles the bullets the same way as 2D