It's wrong to thing that Indie games must run on all pcs. They usually have simple visuals because it's less demanding in manpower and saves a lot of time(and money). Just take a look at Bastion's system requirements...
Also, my Pc is old, so it's impossible to me to make a game that only runs on high end computers.
I have a dual core 2.33, 2gb of ram, and a Nvidia quadro 512mb.
The game only requires 20mb of vram, there's no reason why it runs slow for you.
I play it at 60 fps, even with the light effects on, which are disabled by default(you can turn them on in the "Modify" door).
Try updating your graphic drivers.
Is anyone else heaving performance problems?