I know it's a stupid question, but I couldn't find the answer on Google or here. Ideally, I'm looking at best-case-scenario, common-scenario and worst-case-scenario statistics. This is excluding the player(s) and enemies on the map since I'll know that. These statistics will affect my entity info data-structures, right down to how I decide to build my maps and maybe the complexity of the game.
I realise this question is pretty general so I'll narrow it down by saying that our target game is an indie game of decent quality, comparable to a PS2 game and the genre would be an action-platformer. I know map-size plays a role obviously, so just say an average map-size will do. I'm more trying to get some basic ideas as I'm in early planning phase. This isn't just about video memory, it's about things like finances too as I doubt I'll be able to source everything free.
If someone could perhaps give me an estimate based on their experience or if there's a site with some info like that, I'd really appreciate a link, thanks a lot.