It is a brilliant game, I really enjoyed it and spent a couple of hours to get 303 points:)
Some tips for those who can't beat 100%:
1) You should only heal when you have 0 HP
2) If you have to choose between scroll and level up (for healing) — choose level up. Because it also increases your max hp and makes the scroll more valuable later in the game
3) My strategy was to explore the map quickly, try to save healing scrolls for later and not fight too often. You should find a wizard with level 11 and also mark as many bombs as possible. Then, when you reach lvl 11 (11hp) — kill the wizard and you will have lots of free gold spots marked. You can collect them to level up, heal yourself (and save scrolls for later)
4) Actually, when you have 11hp, you can explore any area (if there's no bomb for sure) because it's the maximum damage in the game. Don't forget this