The countdown timer displays the wrong amount of time remaining if the page is left open and the execution is paused for whatever reason (in my case, I think it’s because my computer went to sleep, but some browsers may pause JS execution in background tabs so that could also potentially trigger this).

Steps to reproduce (Safari 11.0.1 on MacOS):

1. Open Ludum Dare website during an event with

TilePix only supports orthogonal maps (currently - hopefully we'll be able to support other types in the future). A sensible error should be returned on Reading a map which doesn't have orientation="orthogonal".

Need to set up a constant for each type:

• orthogonal
• hexagonal
• isometric
• staggered

Then, using a switch statement, check against each, returning an error if not