Thank you for your input, much appreciated.
Played some today. Because I'm so accustomed to using the keyboard, I found navigating with the mouse to be very cumbersome, but I can see how it would be helpful or more attractive to a newcomer.
After playing with keyboard for more than a year I guess you are indeed very accustomed to it. Still, it's how it works on Mac and Atari, so after a few games I expect you would be completely used to mouse controls and actually prefer it.
Tip: you don't need to click exactly where you want to move, but only at general direction and the game will automatically stop at doors and before bumping into monsters. Usually you want to click further away, so when you fight monsters for example don't click on them, but anywhere behind them, unless you want to shoot arrows or throw daggers/shurikens, in which case you do need to right-click on a monster exactly.
When I was testing potions I quaffed a potion of monster detection. It prompted me with, "Heh." I thought that was weird.
I've added little messages like that where there were none, so when there is no visual effect on the screen after using a magic item the user still gets some feedback the action (read/quaff) was actually performed.
I started typing monster detect and keying the m made something pop up that said, "magick". I could at that point key in my label.
So when when you read a scroll or quaff a potion that is not automatically identified, first you get a message about the effect, like "your hands start glowing red". The game then pauses (blinking cursor) waiting for acknowledgment to make sure you have read the message, and then after your click mouse/press a key, it prompts you to name that potion/scroll you've just used.
I quit using the mouse for moving around at some point, but used the mouse for occasional actions. On Floor 5 my game locked up. Not sure if the game had an issue or if my internet connection had a hiccup or what. I was using the keyboard to eat a ration.
Possibly I was uploading a new version. If it happens again let me know what were you doing last few turns, like you did now. In any case, I think your game was saved, so if you start a new game with the same name it should restore to the point where it broke off.