Very cool game, it feels very nice !
I have some recommendations : It would be wonderful to choose a level from the pause menu, as progress is lost when game is closed (saving ongoing game to keep its deck would be amazing as well). Score required is very low compared to the score that is possible to achieve. Maybe try an exponential progress instead of a linear one ? (20 -> 40 -> 80 -> 160 -> 320 -> 640 …). When modifying a deck, it seems always better to add new cards, as the number of cards is not limited ? Also, I would like to be able to disable screen-shaking (I’m disabling it in every game I play, makes me sick). Maybe a zoom effect following the path could underline the score made by the track better ? The tooltip effect of the card is highly valuable. Maybe making a tooltip for each tile as well could be a nice improvement ? This way, I can decide if it’s a good idea to make a replacement (or not).
Thanks for your game, and making your code public. I could have a look at one point. Cheers !