We're almost ready to release v1.1 of our Qiso isometric engine and will be lifting the temporary price reduction back up to $15 when we do, so if you haven't already purchased and you're thinking of doing, you might want to grab now ;-). Hoping to get this release uploaded within the next few hours but we've still some testing to do first.
The upcoming release brings support for Tiled Editor's "infinite" map size, support for negative tile positions, and support for maps that contain 'holes' between areas of land. All of which means making immensely large, oddly shaped maps or extending maps over time without affecting player positions etc is now possible. I'll be writing an article soon about how huge maps can be designed and served from server to device in chunks allowing for seamless map traversal on devices with limited memory capacity.
This release also adds layer opacity triggered when entering or leaving tiles, allowing for roofs to be turned invisible when walking into buildings, walls to be turned semi-transparent when walking behind them, and an easier mechanic for opening and closing doors when passing through. Again I'll be writing an article to better explain this.