Q Quit
R Restart

Don't start playing then notice these at the bottom-left.

S Save
A return to savepoint

The numbers, from the top left:
Level - you seem to attack faster and are all-around tougher as this increases. Increase by choosing the 100 option from the blue wizard guys.
Health - HP. Increase by drinking potions or buying from the totem (top option).
Attack - Increase by acquiring weapons or buying from the totem (middle option).
Defense - Increase by acquiring armor or buying from the totem (bottom option).
Totem$ - Used to buy things from the blue totem thing. Increased by killing monsters.
Wizard$ - Used to buy things from the blue wizards. Increased by killing monsters.

The next box is your number of keys and the current floor number.

The save option is glitched. If you load while in middle of a battle or shop dialog, you'll still be in it when you load. It'll display your level as 1 too, though the game mechanics will still handle the level correctly.

Oh right, and the red merchants sell keys.

A%#&@*$@, I beat the boss on floor 16, then did a save restore to before that point. Now I can't fight him, so I %#&%ed.

The merchant who does a trade for $500 will glitch too if you make the deal and then restore -- the game will lock up if you try talking to him.

This game is ( ... )ing bugged to boot

One of the artifacts gives you the power to see the stats of nearby monsters by pressing L. Don't do this. This screen can get stuck.

Your reward for dealing with all the bugs and winning:
You get to fight a boss that you fought already, see scrolling white Moonspeak against a black background, and are then dumped to the credits screen (viewable via Q) and back to the main menu.

5 try, and it is done, main priority it is make lvl as high as possible. Ended with 110 lvl 2200 atack 1300 def and final battle start with 180 000 hp. Dont go to the last floor until you buy all you need.

#9 - #8 here. I probably should have mentioned that you can cheat by finding a weak enemy, saving, attacking it, and quickly reloading before the battle is over. Infinite xp, infinite $. GJ doing it the hard way. :)