I also wonder about the the shape of the sword. The mune looks like it has been polished way down or something (weird sori, barely any mune-machi left). The shitaji-togi (foundation polish) is pretty bad looking... meaning that the edges (shinogi-ji, etc,) look rolled over and not straight. Also the way the shinogi-ji goes into the nakago looks off.
These are just things you can examine yourself, and compare with higher level swords (or pics/oshigata) you see. It's hard to tell a whole lot about the sword from what I have seen, but I would not worry much about the signatures, and look at condition and quality. From the shape and lines, it was either not very well made or it has been altered from polishing... or whatever...
You do have a hamon that looks like displays some activities, if you learn to view it correctly (let the light from a light bulb reflect off the face of the sword, and move it around to see what you can see)...
Anyway... kazuuchimono- very possible... Muromachi jidai- almost surely ---pretty much just agreeing with what the others have told you already. Just FYI- some VERY good swords were made in the Muromachi period, but a lot of low quality ones were too...
All just my opinions that you can use to help form your own...