Yes, I know exactly what you mean, and yes, the game is a single biome. I toyed with the idea of having multiple biomes, and it's not even that difficult in terms of code—it's just a lot of graphic work and, above all, planning. Making sure each biome-world has completely different graphics and enemies, while still sharing the same engine logic. Crystian consists of 3 maps that use a single character set, but Adrian already uses its own separate character set for each level. So in Adrian's case, it would just be a matter of redrawing each level, which is actually what I'm doing right now anyway, and the graphics slightly differ between levels. If only it weren't so incredibly time-consuming to design different types of enemies and their animations, but in a way that they share the same size and behavior across the entire game.
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Thanks for taking your time to answer, very appreciated. And my bad, my question was indeed meant for Adrian, sry about that. You answered it anyway so all is fine in this regards. Just keep an eye at yourself: I can imagine it's a lot of *detail* work that isn't so much fun. And what I didn't consider - as you mentioned - it's not only about the graphics, it would influence level mechanics as well. The GFX look lovely already as they are! So please don't burn yourself out just because someone like me has a request like that. In the end of the day you aren't Santa Claus - at least to my knowledge :-) . Just keep up that nice C64 work. That would be splendid.