- visibleEntities is way overloaded
- entities should probably belong to room instead of layer
- layer compilation
- don't tick entities without any ticking traits
- ~~production build~~
- ~~Split Persea packages~~
- ~~Remove @avocado/persea~~
- A lot of "topdown" could also be used for side-scroll/platform
- "tiles" should probably be "layer" 

Opt: