Yes, very good advice! The enemies' attack indeed needs to be more obvious. I think we didn't explain well that the heroes in the training are only for demonstrating their skills. You need to defeat the dungeon multiple times in order to unlock them.
Thanks for playing!
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That may be a good idea, or at least saying something like the heroes are for trial only in the training room. Our original thought was to show all available heroes in this game to the players, in case we didn't introduce the heroes well, so at least let the players know they exist lol. Once you defeat a boss and save a hero, you should see a new hero in Home, just like what you suggested.