Not bad
Nice but simple graphics. It's not the most exciting game (not your fault, that just the nature of the game), so you might want to consider making it a bit more visually enticing. Also, if you're able to make one, a high score board or some other sort of ranking system (e.g. $1000 = no skills, $100,000 = good skills, or some such thing) will enhance the games replay value. Good effort!
Too Easy
You should make a version two where there are loud noises and flashing colours. Clowns running across the screen. Perhaps a screaming duck. Something to make me lose focus. Because lets be honest here it wasn't much of a mind game. More of a time killer. I gave it a decent humor score just cause it was funny how much you could win. Just go all in everytime till youi get bored.
make a limit.
It's too easy. There has to be some point where you win. It's a good timewaster though
good
very fun, but way too easy, i got to a billion dollars in like 2 minutes
Overly Easy
Needs to get difficult fast, or possibly have more than 2 shells shuffle at once, to throw off the eye.