Yeah, that looks pretty much exactly like Doom. Doom is fun though, so it could be good... and even though I like shmups, it's nice to see a DC game that isn't one for once.
The DC really is a fantastic homebrew system, though... I mean, with most systems playing CD-Rs with no modification, and with easy development as far as consoles go, and a decent amount of power, you can't do much better...