This is a very cool idea for a game, and I really enjoyed the fixed camera a lot! I downloaded the game and had no problems with the lighting, so if you're someone who hasn't played it yet, I'd definitely recommend downloading versus playing in browser.
I do agree that some hero lighting or very low ambient light source from the player would've been nice, but it didn't impede my time with the game. Overall, I'm super impressed that y'all were able to make this big of a game in this small of a time frame!