for your first 3d Game pretty nice or not only for the your first over all pretty nice Game i only have 3 things that are triggering me a little bit:
Warning 1:
sry for my bad Englisch :)
non Game:
1: in the Itch.io settings for the only version PLEAS make that fullscreen-button disable Unity has it own version of it and it works a little bit bitter i think.
game:
Warning (2) my Opnien these are just Game feling stuff
1: dont set velocity, add velocity, i think it would fell better. If when you let out from the W key you dont just stop mid air, rather fly furter :)
2: thats hard and if you dont know very much about uniry coding (Corotines and so) maby a lilte hard but maby you could make that the jump is 0.1 second after you left the ground still available. Couse maby i am only to dum but i am often just running down couse i press it to late.