I have a couple more suggestions based on some additional play:
-I know some people have mentioned maps before, which are an excellent idea, but one thing I think would be very useful would be a little HUD display indicating the current level of the area that you're in, and maybe something pointing the direction towards the next higher and lower areas. Without this information, I find it rather easy to wander too far afield and get into a situation where everything is too high-level to take on, get turned around, and have no idea how to get back to a safer area. Sometimes the generated terrain will have some decent landmarks that can help you find your way back, but I think it would be helpful to have a better way to orient yourself in the game's procedurally-generated environment.
-Consider having a way to highlight inventory items or maintain item inventory positions across death/resurrection. If you're carrying a lot of inventory, there's not currently a good way to differentiate equipment at a glance (just general item shapes), so every time you resurrect you may have to mouse-over a lot of equipment to figure out what you were actually using vs. what you were holding for trade, re-equip everything, and so on, which can take quite a bit of time and aggravation on resurrection, which in this game can happen often (or at least it does the way I play it
).
-Related to that, I think it would be great to be able to flag inventory items as "jettisonable," and have a hotkey set up to jettison everything in that category in one go. This would allow you to hang on to stuff to trade but also be able to dump it all to use your grapple quickly if needed, rather than trying to evaluate the items in your inventory and dump them one by one in the scant few seconds before a demon mops the floor with you...
Edit: After another play session, a quick suggestion and a possible bug:
-Would it be possible to have an "item weight" listing in item attributes as well? This would make equipment/weight calculations much easier.
-I picked up a new antigrav pack from a vendor and placed it in inventory, but the hotkey says "no valid packs" when I try to use it. However, the antigrav pack appears in inventory just fine, and works correctly when I toggle it on and off with the mouse. Packs that I've picked up from drops and appear in inventory, however, do work correctly with the hotkey.