here's some random picky critique, take it as you will:
For the monster sprites: consider using a padding between frames in the spritesheets (configure in the sprite slicer), I think this is what causes that thin line at the border of the monster's sprite square.
Also having a visual strike marker (brief effect at point of collision) would be very helpful for the player to gauge hit distance, since the 2D nature of the sprites makes it sometimes tough to tell when your melee attack is in range.
You run faster diagonally, and can jump quite farther when running diagonally as well. Its your choice to change this, but know bouncing around is going to become a pro-strat if you keep this in.
sidenote: those two files (player_win_x86.pdb and player_win_x86_s.pdb) in the root directory are files that are generated when you select "development build" They kinda bump up the filesize, and you don't need them to play it.
sidenote 2: after building, check the editor log to see a breakdown of what takes up space in your final build. I'm guessing you could slim the filesize down a bit with some of unity's texture compression options (for nonsprites that is)
I look forward to seeing this finished, don't drop it!