I had to smile a bit when I read "Do you remember OpenTTD?", because I don't. I remember the original Transport Tycoon that was before the "sequel" that OpenTTD is a clone of. I must be getting old.
Since the post is in English, it would have been better to have screenshot of Simutrans in English as well. As for the English itself, it seems to be at its worst right before and right after the Paksets heading. There are a few other things there, which isn't directly language errors, and a bit technical. The first is that Simutrans is not really an engine either, as the code itself is feature complete and pak sets do not alter how the game works. Scripting is slowly adding some customization, but I don't think you can make as drastically different games out of it as is possible with a game engine. Unfortunately, there doesn't appear to be a word for what Simutrans is. The other thing is that pak128 does not mean that buildings are "128 pixels". (Pixels what? Wide! Although strictly speaking, it's one of their diagonals, but that is absurd nitpicking.) It's the tile/grid size that is 128 pixels. As far as the player can see, buildings can be bigger than that. (Although within the code, it is indeed true that buildings in pak128 are 128 pixels wide. Bigger buildings are just an illusion.)
But in general, a good presentation. There is a lot of bad English on the Internet, even from native speakers.