First things first:

You must be asking yourself: just the general store? yes. The selection of items was incredibly lacking in the original demo and thus i've decided to add these to make the experience a bit more diverse. However, they'll be the only items you can buy.

There'll be no shop improovements, better equipment will always be found in chests or dropped by strong enemies, but this doesn't mean that the items sold aren't worth their value.
As it stands, you cannot buy more than one type of equipment, having shop items be the backup will always be a good and welcoming thing.

Examples of items:

Rogue's Cloak

An item that is incredibly useful to avoid damage, however, it's also got the luck raising feat, which allows players to deal more damage with items.
It plays part for players who wish to be a little bit more reckless with a particular character. Being more out there dealing damage and avoiding hits or exploiting weaknesses with the many items at their leisure.

Medic Mantle

Worn by certified medics and wannabe battle medics with the propper licensing. These garmets will provide decent protection but also a little boost to health. Health management is incredibly important considering the many options that you have aren't as reliable than the many consumables at your disposal. Survivability is key so being able to tank one or two more hits will prove useful.

Rooster Mask

A mostly offensive item, the rooster mask will serve its role in simply boosting your offensive capabilities as well as your speed.
Despite how silly it may look, the violent urges it gives are enormous!

Protective Mask

Once worn by police and later discontinued and sold as a civilian grade equipment, this mask provides incredible defensive capabilities, however, your health will be neutered a little bit. Its benefit is that attacks that'd make your character see worse are completely counter acted, making it useful for most situations.

These are but a few of the kinds of equipment you may want to get throughout your adventure and that will always be there in case you ever need a small boost in any particular aspect.
Without harsh drawbacks, these are the most reliable items you'll be able to get in the game.