Well, it can be considered a prequel, before the events narrated in Phantomas: Infinity Saga. It is a direct continuation of the Phatomas II/Vampire story.
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Going the 'Return to Monkey Island ' route so to speak :). Nice. I think I got a bit confused though. I thought this was going to be 'simply' a conversion of the ZX Spectrum game 'Phantomas Tales 4 Severin Sewers' (with the sprite being swapped for the C64 one). But your game looks far different (and better !). Really looking forward to this. Hopefully it will be a very nice (big) map, like Vampire (for me to draw ofcourse:) ).