Really nice game! Doubly impressive that it was all make in a weekend!
The graphics looked really nice, along with fitting SFX and music that gave it a great classic SNES/Sega Genesis era feel.
The gameplay was pretty good, though it would be nice to have a little more attack variety to spice up the beat-em-up feel. Also, and maybe this is personal preference, but I would have liked to still be able to move while punching. The boss was pretty simple mechanics-wise, but it worked well enough.
Having a story, or a little bit of background scenario or lore would also help pull me in too.
I think most of my critiques are things you might have addressed if you had started earlier in the jam, so this is still an impressive game! Really great work.
Also, a fellow Construct user! High-five!