Thanks for playing. I watched your video and saw you did a "moonwalk" at one point lol. Not sure how you did that but this should be fixed (or maybe I should leave it in as a feature?)
Unfortunately diagonal movement would be too hard to implement as I would have to draw a bunch of extra sprites for each character for the diagonal directions. There actually is a key to open the inventory - it's 'C' (for character menu). Maybe I can make 'I' work as well. I can add the option to move with the keypad (and eventually you will be able to rebind the controls). I do plan to add autosaves and maybe have it save on exit too. Also, nice catch on the bugs.