I find the difficulty fun and challenging and it is half the fun of the game just being able to figure out where to go and what to do and using recipes to restore health so I can make it when I am low on health.
but in terms of marketability I do believe the standard difficulty of the game may be narrowing the market for which this game could reach. By adding what I like to call a casual mode would open this game up to alot more people.
I think the game since it's so pretty appeals to alot of people simply for it's artistic style. Now I know this is not why the game was originally developed to be some pretty thing to look at. I love the way the game was developed but if you want to make more $ hahaha which I think you all deserve and the price $30 including a full amazing game plus the tools to create your own game is a bargain in my opinion.
I think my gf would really like this game is the difficulty was a little easier bc she hates underwater and I love anything to do with water. I was on the swim team for like 13 yrs lived by a lake and went skiing , sailing, jet-skiing, and to the beach all the time. So of course the underwater theme is very sexy to me.
I wasn't expecting her to like the game due to the underwater theme, but even her hate for water couldn't hold her back from commenting how beautiful and fun the game looked. Also she tends to do better on games when they have that easy or casual setting. I think she would love aquaria but at it's current difficulty she'd probably get a lil frustrated.
I know this would require some work , I mean technically you can just change how much damage the attacks take and the health you receive but would it be balanced and would it be too easy or would it still be fun for more casual gamers. So if anything like this ever happens I think aquaria would reach a much larger audience and I said about making money and I know it's not all about that b/c you can see the passion pouring out in every aspect of this game.
Anyways I just love aquaria and I want everyone in the world to be able to experience it

I'm happy with how it is.
Also I must comment the support is top notch. I can't believe you guys are able to keep up with everything knowing that you must be extremely tired since you just shipped the game.