I don't know much about Laravel or Symfony, but your error pages show a full stack trace with the source code of the PHP files. Might want to turn that off.
For now I'm really appreciating the feedback I'm getting (only started working on this 4 nights ago).
If your hope is that you could gain some initial customers from here, it will almost certainly put a significant number off of giving it a go. I know you are super early with a MVP but as you are asking people to consider paying you already, I hope you reconsider.