Dragon Blood dreamcast.
Some dev options are present, except errors, they were not removed for the commercial version.
In games, start: L + R then left to trigger God mod and Frame time and flip
In games, start: L + R then down to go to the next level
In games, start: L + R then up to trigger teleportation
The last levels are not finished, the end cinematic does not exist or almost does not exist hi hi hi
Some differences are notable as you will see in the photo which compares the prototype and the final version.
You can download it below: