I don't know who makes the medals but I don't think it's possible to get the "bare-handed" achievement (I guess you need to have "EMPTY" in your inventory for this to happen, or you'll get other achievements by holding other equipment)
That guy Tarjan is impossible if you go bare-hand on him, unless you hack, of course.
You should at least, add a recovery time for Tarjan everytime you hit him, or make him bounce a bit further so he doesn't always get you instantly with his balisong-like weapon every time you hit him bare-handed, the idea is to make the medal "achievable", not "hack-need".
Even if it's a bit short, the game can be improved further with a level-up system, more equipment, punch buffing and more stage.
We had a variety of songs depending of the situation, that's good for me, and since I like 8-bit-like games, I can add extra points for it.
I'll give it a 3/5, due to its shortness and the huge disadvantages (or advantages) you have when facing some enemies (especially this boss Tarjan)
Thanks for reading.