I'm throwing away the pricing model in the original post entirely anyway, that was the completely WRONG way to do it. Now I'm thinking something like $100 per level (with all enemies and stuff included) if the game's an action platformer (which is my specialty genre, but I'll need a different plan for genres that don't fit that structure, such as Point-and-click Adventures).
I appreciate the pointers, however, and I'm reading the link you sent me right now... Yeah, I think I get the idea.
Thank you.