Let me know if it works that's what worked for me anyway.
I just tried it but since it spawns enemies at the start and shop at the end of level and also two portals, doesn't really work that good, even for enemies it still lags with timer, but yeah at least it's only on first level and only on web, still thank you so much for suggestion.
Also i really like your blackjack game, animations and sound effect and main menu, everythings is so interesting, looks like you had fun with all those little things, good luck in game jam