I'm not too sure it's serendipitous to be told to be lucky. :P
I like the general gameplay idea, but found it frustrating when enemies spawned at the far ends and I wasn't able to deal with both in time. I maxed out move speed first but even with that I couldn't go end to end quick enough, and that's not even taking into account grabbing coins and power ups. I did really appreciate being able to stockpile money on failed attempts, the best strategy to me is grab as many coins as possible and don't worry about losing health. :)