The card arts are very good. Everything from UI, art style to sound feels cohesive and thus makes the game feel polished for a solo-developed game. And it's also immediately playable from the foundation of blackjack rules. However, the additions on top of that (such as the roguelike elements) don't quite contribute enough to the overall gameplay just yet.
Reading from the logs it seems to me that you originally had betting be a more risky play, but with this version I've play tested on (1.3), it's precisely a coin doubler for whenever I gather a hand of 21. It leaves no reason to not just all in every time you have a hand of 21, worst outcome is getting what you put in back.
That, alongside the current pools of abilities (perhaps too powerful at the moment) makes the game have very little challenge. Also, it would very helpful if there was a mandatory tutorial explaining what everything does.
That said, I see a good foundation so far for what this is aiming at. I believe this has the potential to become an interesting roguelike card game through further development. Good luck!