Version 0.2
Pros

Ledges (top only).
Moving platforms.
Crates that can push crates on moving platforms whilst you stand on top.
Reads the map as level geometry.
The above features can be removed to retrieve tokens.
Can probably be optimised.

Cons

No slopes.
2618 tokens (the raw engine is 1711 but you still need to make a player, enemies, update, etc).
First come, first served resolution: You only get 1 collision contact (you have to be creative to get more).

Updates
Updated this page and rewrote the engine to use less tokens and be more extendable. Only saved 252 tokens sadly but every little helps.