I'm not a fan of the lighting effects, but the Javascript animation on the web page does one thing I think is fully justified - "misaligned" pixel art, i.e. spr

I'm not a fan of the lighting effects, but the Javascript animation on the web page does one thing I think is fully justified - "misaligned" pixel art, i.e. sprites positioned over the background by fractional pixels. I think this is beneficial because it greatly improves motion quality. Even with high framerates, and even with CRT or strobed LCD style low persistence displays, if you're snapping everything to a grid then the only way to get perfectly sharp motion is to limit movement speeds so everything stays naturally aligned to the grid. You could think of it as a temporal analog to font hinting. Some games do this, but it severely restricts the design possibilities, so I think allowing misaligned art is a good tradeoff. Unless you're using dithered transparency it doesn't cause any obvious artifacts. Nintendo does this with the pixel art in Mario Maker and I haven't seen any complaints.