A TRUE HARDCORE PLATFORMER!
1- There's a full run on Youtube that can be seen in tandem with the game.
2- You can pause the game, infact, the game pauses after you beat a level. Use that with #1 to plan ahead the next level and minimize casualties, mainly on those levels that require you to run for a hawk bump.
3- Awarding the <10 deaths medal automatically awards the <30 deaths medal AND the game completion medal, so go for it.
4- PERSEVERE! Even with walkthrough support, you'll have to master the ledge mechanics: You can walk quite far from them. This will help a LOT on long jumps.
Don't expect to beat the game with 0 death, that's all. I did it with 9 deaths so I can't say for sure if 10 deaths are acceptable. 11 sure ain't so reset if you get it.