If you see something interesting that you can't get to, think what shape would let you get there. Earn a lot of money to buy needed equipment by defeating creatures and finding treasure chests. Use the right kind of armor. For example, some armor does not get damaged in red lava, some can get you a lot of gold when you knock down an enemy, some give you a heart very easily and some let you breathe in water. The name of the armor often gives you a clue to its use.
Different weapons have special uses.
Like armor, the name often gives a clue to the weapon's use. Find hidden doors by destroying blocks. Some rooms let you change appearances at will. This will make the game much easier. Watch the Demo Screen carefully.