Short explanations on what does what, and how to beat the game
Descriptions

Heart – Fills one of your empty hearts.
Enemy – Deals one heart of damage and then dies.
Tree – You can go over it, but if you do, it can randomly turn into an enemy.
Rock – They block your way, can’t go over them.
Key – Unlocks the exit.
Exit – Unlocks after picking up the key, and leads to the next level.
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Chest – Gives +20 to your score.
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The Song of Khamor – You can pick this up at the very beginning. It warns you (makes a beeping sound) when enemies are nearby.
Velandra’s Band – Shows where the Key is. When the Key is collected then shows the Exit.
The Seer’s Gem – Reveals the whole map for a short time.
Hat of Khamor – Increases your hearts from 8 to 10.
Horn of Bovrath – Reveals map from your position to the exit.
Blade of the Brave – If you die on this level, all hearts are refilled.
The Eighth Relic – If you die in this level, then the progress is rewound back to the point where you picked this up.
Vaelthar’s Crown – In this level the Enemies don’t hurt you- they heal you.
Talon of Rhaegnyr – You can destroy rocks in this level.
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Dull shard – 1 of 3 shards needed to open the Vortex (spawns in level ~ 6, 7).
Shard without shine – 2 of 3 shards (spawns in level ~ 8, 9).
Shard – 3 of 3 shards (spawns in level ~ 10, 12).
Vortex – After collecting all 3 shards, the exit changes into a vortex, that brings you to the Final Level.
Final Level

In the Final Level you only have 60 seconds. You have to find and activate (bump into them) 3 Pillars, and then get to the exit Vortex. Make sure you have plenty of hearts before you enter the Final Level. Explore fast, there’s not time to be cautious.
Enemy – Works the same as the regular Enemy- deals one heart of damage.
Swamp – Works just like Trees- you can go over them, but they can turn into an enemy.
Pillar – There are 3 Pillars. Find them and bump into them to activate them (turn from red to white).
Vortex – Spawns when all three Pillars are activated. Enter to beat the game.
Endings

2: The bad ending is when you activate all 3 Pillars, but don’t enter the Vortex.
3: The despair ending is when you don’t activate all 3 Pillars.