So you are not the first in this jam to do that but for me a game where winning or loose is 100% a matter of chance is not really a game... i guess its alright if real money is involve since the gain or lost are real.
But for a video game, i'm trading time for fun and tossing a coin and looking if i lost or win ain't fun, for me at least.
Also the pixel art you have i so minimalist that it become hard to decipher the screen, the font is almost unreadable et the symbol are extremely aproximate.
That being said, you could probably add some minor tweaks that would greatly improve the experience (some kind of way to not be just a luck game)