You can find a check list in the game itself, from the title screen.
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You can still position them by variables with them having different sizes, if you use a reference point (like the middle/bottom of the sprite).
But you're right that the trimming should be optional. I added an option to turn it off in the latest revision ;)
I opened your file using the latest version, and it looks exactly like Photoshop. But I use CS4, so I'm not sure everything's there. Is that how it's supposed to look?
I just published this version, if you want to try it for yourself :)
At least we're making some progress :)
I uploaded a new version with some bug fixes revolving around masks, but if you're using features unique to CC it may not be what you're looking for.
Could you please describe what exactly does not work with your masks? And if possible, could you please send me a PSD file showcasing those problems, so I can investigate further?
Okay, I'm back, and with a new version.
I believe the last problem was due to me taking some shortcuts with the layer groups that work with files saved by CS* but not CC. It should be fixed.
I also improved the support for the layer masks.
That being said, the adjustment layers are currently not supported. I would like to support some of them (probably levels, curves, gradient map, brightness/contrast, hue/saturation & color balance) but they're very tricky and the documentation is... not great. So it will take time, at the very least.
Sorry 'bout that, re-implementing Photoshop's renderer is no easy task, and it will take some times before everything turns out perfectly ^^'
Hmm. That one is a lot more tricky. Without access to the PSD file, my guess is that it may be caused by a layer mask. I've uploaded a new revision that should be more robust dealing with those, so maybe it will be able to load your file now, but I can't guarantee the output will be 100% correct.
I have a task on the project's Trello board to fix that for good (https://trello.com/c/STRvn6Xu) but I will not be able to work on it before Tuesday, and even then, it might takes some time to get it right.