I'm glad you enjoyed the demo! However, we just released a new public demo, so there won't be another one for a long time.
This probably isn't what you want to hear, but to be clear, we won't ever be releasing LONGER demos; future public demo updates will only add in new features/polish that were added to the main game, but the amount of content will always be the same, ending after the second boss fight.
At the end of the day, Crisis Point is a paid product, not a free one, and the only reason we can make this game at all is because of the support we get on Patreon to fund development. The free demo is currently over an hour long, far more than you would get from most demos, so I'm happy with the amount of content the public demo has; I feel it's more than enough to decide if you want to pay for more content on Patreon or not. If you prefer to wait for the full game instead of donating on Patreon, I completely understand, but until the full game comes out, Patreon will be the only way to get more playable content.