- The tiles have many repeated images while in the original they could flip them and change the color palette. Note that the bushes and the cloud share sprites.

- .kkrieger wasn't 64 kb, it's 96 kb. Still impressive though.

- The image in the tweet is 51.4 kb.

I was expecting some explanation about how the sprites are so tiny because they use a palette of 4 colors (and 4 pixels fit in one single byte), then the colors themselves are stored separately.