Hello!
Defend your Crypt has a demo version now, you can download it through the button on the right. This version has 12 levels and you can run it with or without lightning.
The main differences between the builds are the light and the performance. OpenGL has a less performance than DirectX, so if you're having lack of FPS, or the build is not running directly, change to DirectX build ^^'.
Also, in the main menu, you will see a form button. This button will open your internet browser and a little Google Form about the game. Please, if you fill this out so we can improve the game more!
Thanks you all and enjoy the demo!