Yeah, inconsistent hitboxes between fire/water is cultural debris. Fire will trigger if (foot + 0, 4, 8, or 12 hi-respixels above) intersects the hitbox. Water will only trigger if foot intersects the hitbox. Since the hitboxes are filled rectangles, never weird holey shapes, better rule would be to always only trigger on foot, and increase all fire trigger areas downwards by 12 pixels. I'm reluctant because this would be breaking change, and really hard to detect: Nothing would prevent old-tiles with new-game, nor new-tiles with old-game.
The cultural debris comes from: Fire originally hit the eyes that dependend on the spritesheet, not (foot + 12 above). It's stupid to depend on the spritesheet for such unexpected detail like eye position, therefore I simplified to (foot + 0, 4, 8, 12 above) and kept backwards-compatible hitbox definitions in the tiles.
Still busy, haven't looked in peace at the updated tiles. Thanks for sticking to the 8-grid! I'll take a closer look eventually and go through your changes.
I remember, as a player, that the Chicago exit/goal was hard to find; the exit looks on first sight like any other train wagon, with only subtle detail to set it apart. Instead, exits really should pop into view, it's an important place in the level. The quick suggestion is to draw a large animated arrow over the exit train car. Combine it with the "board here" sign? But I'll have to look at the tileset in peace again before I can suggest anything serious.
It's hard to add space to the left/top after-the-fact to existing tiles. Long-term idea for Lix is to allow that, and specify offset in a tile definitions file (txt file). Such definitions are only allowed for gadgets in 0.9.x. That's enough in this particular case where we might add to top of exit. But in general, it's conceivable to also allow them for normal terrain. On the other hand, I'd like to keep things easily-guessable for new tileset designers... unsure how much freedom is the right choice. Definitions text files are already a stretch for simplicity; if I allow them, I may as well give more power.
-- Simon