Your game was super fun to play around with. I was able to reach floor 5 once and then floor 7.
One of the things I noticed was that you don't seem to clear the level attributes when the player finishes it. Because if during the end of one level if I had my mace out, it will continue to be out when the next floor gets loaded. The same goes for items from the chest.
Also, double jump to throw shurikens I found was a strange design choice, because of that I rarely made use of it. I believe if it were assigned to some other key like 'F' or 'Ctrl', perhaps I could've made use of it a bit more.
I loved the concept that shurikens replenish with each bounce of mace. But it also allows players to exploit the mechanic in a few ways, one of which is the player can keep a solid object between him and mace and try to pull. Doing so will instantly replenish shurikens.
Player movement was quite smooth, but my character kept sliding for a bit, a very small amount due to inertia. I found the jumping aspect a bit difficult to control since it has a very small height and the player can do wall jumps, but I assumed that was the expected behavior.
Finally, in my opinion, I think keeping a limit on how far the mace can go would be better since at times I was at one end of the floor and my mace was far off the screen probably stuck somewhere.
Crystal clear instructions, excellent enemy behavior, and bullet projectile; with that, overall a solid entry mate. GJ!