When exporting my font to SVG I kept getting an EntityRef error and finally figured out it was the & (ampersand) I placed in the name of the company in the copyright text field.

Holding shift and left clicking to select multiple continuous layers.

It's really nice to have all those guide and grid options, but they would be of much more use if glyphr actually snapped to those during editing (moving / scaling, etc.)

Say, you've drawn character on a piece of paper and want to make something similar in editor. It would be much easier to do stuff if you could drag and drop photo of the character to the background of the main content area and then be guided by it through out the work. Of course, you should be able to adjust it according to grid.

Maybe with a drag and drop UI.

For some people, like my self, we may want to create entirely new letters with complex curves and symbols; therefore it would be nice to, say, draw the symbol on a piece of paper, scan it, edit it with a third-party "paint editor," then upload the resulting image into Glyphr. A three month font type, could be cut down to anywhere from fifteen minutes to a few hours. One imager, per letter/symbol/number.

Also, I was unable to open anything in Safari...

A Chrome Packaged App version with file autosave would be great.

Ability to select two shapes and perform a boolean operation on them, such as subtract and union.

An automated way to export a package that contains all the font files needed for a proper web reading in all browser (.oet, .svg, .ttf, .woff), additionally include a css file with css code for implementation and a sample html file (similar to what you get when create a webfont on http://www.fontsquirrel.com/tools/webfont-generator)

Add an interactive trainer, like http://type.method.ac http://shape.method.ac http://bezier.method.ac

Any other file types to consider?

An automated process to create accented versions of characters

While you are editing a certain character, specify some other characters to show to the left or right of it, so you can see how that character looks in context. Maybe also edit kerning values as well.

Right now there is only Undo!

Improve the live preview experience: Tear it out to a new window, support paragraph-level previews, automatic word wrapping for sample text...

Currently handles can be locked vertically or horizontally. This would enable you to lock a handle to any arbitrary angle.

An automated process to take all the characters in a font and slant them at a specified angle.

Fonts don't support paths with stroke thickness, only fill. But, we could allow you to specify a path with stroke thickness, then when exporting a font, that path's stroke could be outlined to create a filled shape.

A new Path Point action that would set the handles either vertically or horizontally, and lock them to that orientation. Useful for the extreme left/right/top/bottom points of curved shapes.