Your saves haven't been deleted, the game's just using a different folder for some reason (definitely not my fault though, probably some software update).
Create a new saved file, and then do a full system search for "EBF4": the most recently modified file will be in the folder the game is currently using. Move the older files you find from that search into this current folder.
If someone can explain that better, give it a shot.
Updated to version 1.0.8. The only difference is that I added some links to the Steam Greenlight page. If the game gets on Steam, I'll create new content and add that to the Koingregate version too. So go vote for it please!
Updated to version 1.0.7!
The only difference is that I've changed the compression method to something older. This means the game is slightly bigger, but it might fix some compatibility problems. Most people probably won't notice a difference though. If you do, tell me plz.
Just uploaded a new version! I've fixed Revive's power, made sure Oak doesn't buff himself more than once in a row, possibly fixed a counter-attack related bug, made music transitions faster, and fixed the Slime bug... I probably made other changes, but I don't remember them. I also added a feature where you can easily transfer saved games to Kongregate from other sites, though you won't see that if you only play here. It should say version 1.0.1 now.
I think I've got it:
A fish uses machine gun. (which targets random players.)
It hits the slimed player, killing them. The slime spell animation starts playing. The fish's machine gun then hits a different player, and changes the currentTarget variable. The slime spell then doesn't effect the slimed player because the currentTarget has been changed. COMPLICATED.
I'm still trying to figure out what causes the bug related to dead slimed-players. All I know is that sometimes slimed-players don't revert to human form properly when killed. I haven't been able to reproduce this, so if anyone sees this, send me as much info about it as you can. Including what skills you were using when the player was slimed, what killed them, and what animations played when they died etc. (a video of the battle would be awesome).
 "Epic Battle Fantasy 4"){kind=icon}
 "Epic Fantasy Battle 4 Cheats"){kind=icon}
 "Epic Battle Fantasy 4 Walkthrough"){kind=icon}
Update: Slimes should work now.