We finally have the proof thanks to Laurent that a working proto of the game exists.https://www.sega-dreamcast-info-games-p ... -dreamcast
Sorry the article is in french but to summarise, according to Greg Orduyan, artistic director, the game was canned because of the lack of confidence of Konami in the Dreamcast.
This beta is dated before the E3 and has 5 playable levels (most of them are not connected) that you can select from the start menu (one of them doesn’t load), and there is also a boss fight.
This is a nice overview of what we have missed..
The owner of the GD is not Laurent obviously and he still doesn’t know if there is a possibility that the game might be one day shared or sold..