I've now uploaded the final demo build of the game which contains some bigger changes to the gameplay. Main changes includes:

• Purchasable items which makes the game a bit easier (2 out of 5 in the demo)
• Rework of the UI and menus to fit the theme better
• Changes to the promotion system and difficulty curve. Should make it easier for everyone to reach a higher level.

I'm hopefully now feature-complete and be able to release the full game soon. There is still an optional multiplayer mode that I thought of but it only works on Steam anyway and I will decide to do it based on the interest of other people and my motivation :)