Haunted (old game)

Old Game #1 Survive in a Dungeon for as long as you can. There are many enemies, but when you kill them, you get less powerful (e.g. slower, weaker, slower recharge, slide). You also have a shield and a dash to use. Every 5 levels, you must fight the ghosts of every enemy you have killed, then you have an opportunity to use collected treasure to upgrade yourself (e.g. faster, stronger, quicker recharge). Made in a week (not full-time).