Various Tips
Don't forget to hold left or right part of the screen to make your character glide over obstacles like spikes or buzzsaws.
Spending in-game cash is a great way to improve your experience. One of such ways is the entire game upgrade that gives you both new monsters and new score multipliers that improve your score dramatically.
You can also use your currency to continue the game when you get killed, though it is probably best not to use it too often.
Another way you can continue the game after dying is through watching ads. You don't always get this option, but when you do, use it because it is fairly harmless.
Since all games are random, there is no need to memorize the paths or strategies. Simply go with the flow and let your hands do the work.