An overall pleasant experience. I never played Blackjack but the rules were quick to get the hang of, and it shows a lot of promise. The graphics are appropriate.
I do agree with a few comments, in that having a small hand at all times other than the aces up your sleeve or trump cards could really make the game less frustrating, as even with an optimised deck, a single bad shuffle can leave you to be mercilessly pummeled. Alternatively, the ability to reshuffle one's deck (with or without the discard pile) in a pinch more often, without having to rely on a specific card and instead using advantage or chips, would be quite nice. The possibility to remove cards is nice, but I am unsure it really does much with that frequency. The multiple "cards that are not cards" (i.e. SIM card, memory card, business card etc.) is a very creative idea and I like the humour in all of this.
Final note, do you intend to release this through itch.io as well ? I am asking because my computer runs an obsolete OS for which Steam support was cut off, thus I can no longer use the app. In any case, good luck and strength to you on completing this delightful indie !