I've had a long-standing rule to avoid getting involved in any sort of crowdfunded activities. I didn't donate to Shadowrun or Wasteland, but I did buy and enjoy both of them (I'm plugging both of those games right now, just so you know they're good). I haven't...
Tapping the retry button instantly takes you back to the start of the level.
If a rock bounces into your mouth, you can catch it and use it again.
Always be on the lookout for ricochet shots, for they're the quickest way to clear a level.