Don't bother trying to memorise any paths or strategies as the games are ALL completely random, you just have to let your intuition make the decisions.
Although you can use the in-game cash you earn to continue the game when you get killed it is more beneficial to save it for the entire game upgrade. A better way to continue the game is by watching the adverts when the option presents itself.
If you spend the in-game cash you earn on the entire game upgrade you will get monsters and score multipliers that will improve your score dramatically.
Remember to make your character glide over obstacles like spikes or buzzsaws by holding the left or right part of the screen.