Game winning catch...
I like the simple premise and mechanics of the game of catching the coins while avoiding the enemies and racking up a monstrous score. It would be awesome to see some power-ups in the next release such as a shield that would deflect the enemies (maybe a 3 hit counter before it depletes). Player attacks like a shock-wave to shatter the red minions (perhaps 1 shot per unit) or some 5-second invisibility or invincibility rush. Of course more enemies would appear to replace the fallen. Perhaps include various higher point value coins that appear for a limited time (3 or more for some chain-reaction-combo-points?).
I liked the health meter especially when things got hectic; maybe include some sort of health bonus items to appear every so often. Could you add a death-type animation when the player's health counter hits 0? Some various sized enemies or even walls within the game-field (e.g. lined with spikes, electricity or fire etc.) to avoid would also add to the challenge.
I am sure that the next release of "Catch the Coin" you will include a rocking soundtrack, more sound effects and some varied backgrounds (themed-levels?). I look forward to it.