First: Thank you, Obsidian, for making a playable demo. You turned me from "not going to be a customer" into a "potential customer".
Now, in order to turn me into a "paying customer", the only kind that counts, you have to do four things:
1) Make controls remappable.
2) Add "move character left" and "move character right" to the available controls.
3) Add an option that lets holding the right mouse button move the camera, with a similar speed as moving the mouse moves the cursor normally (this can be a remappable button, if you can be bothered to include mouse buttons in your remapping scheme, which I strongly encourage).
4) Add an option that lets me target a different enemy than the one I'm currently attacking by clicking on the new enemy, rather than having to turn to face them.