>Enemies won't aggro if you attack and miss, they just walk away
Yes, for easy early game - zone 1 & 2 can spawn non-aggressive mobs, zone 3 and over mobs are 100% aggressive.
>Going to the top makes it a new game? It's really dumb at the start
Only in the first respite zone (zone 1 sub level 0) going up will exit your current game
>Keyboard shortcuts for menus
There are, you can read all about it in the description
>Small enemies/hitbox
You can zoom in/out the screen using keys [Z/X]