Visually, audibly of a high standard and controls were good (but a bit twitchy). The only "complaint" I have is that if you replace the shield with a weapon graphic, it's just a standard platformer again. The only difference from this to another platformer is the attack animation is a shield and not a weapon.
To use the mechanic of "you dont have a weapon" I think you could (in future, as clearly you are time limited for this jam) have mechanics in the world which you interact with in each level to beat the enemies. For example dropping things on people. A bit like HITMAN but without the weapons/guns/close combat. I feel like there's a solid idea there, just maybe needs a bit more time to develop and some creativity around "not having a weapon".