Hi, there. I've been following the hero planners for some time now, and I really have to say that the current iteration is an excellent piece of software. It makes it very easy to build a character, and reasonably easy to figure out the order that I built it when I have to re-create the build in a respec. I'll go apply the "true praise" and toss a donation your way.
First, I found a bug that I figured you'd want to know about. When I put a slash in the "name" field of an unsaved character (i.e. "EG Force/Therm"), and then click "save" or "save as", I get a statement that an error occured. This should be pretty easy to sort out.
Second, I wanted to make a suggestion. In order to better plan the order in which powers are taken, could you include some indication of how early a power could be taken when it's selected? For instance, Stamina can be taken at level 20. The way I was thinking this could be done is to make the squares behind the level 20 and above powers a different color, indicating a range at which the power could be taken. For extra credit, you might consider only highlighting the background behind those after the prerequisites (e.g. only after Health is taken), and then highlight the background behind Health to lvl 20 an intermediate color.
Best,
The Mythological Beast