Thank you so much for your compliments and thoughtful feedback. Dragging upgrades onto cards would definitely be an intuitive mechanic, and tutorial highlight regions being misaligned and cards freezing during the Overflow boss are known issues.
As for your screenshot, I understand the confusion. Based on its current description, the Flexible modifier seems like it allows playing against the same rank (e.g., a flexible 6 "also counts as a 5 and a 7", so it seems like it can play against a 6), when in fact, it doesn't. We intentionally reserved that behaviour for the Allow Doubles active ability, which may be found after each boss round. So a more accurate Flexible description would be "Enables playing against cards with gaps of 1 rank". That being said the valid move in your screenshot is playing the queen on the flexible 10 :)
Between devs, we've also had the same struggle where Flexible makes the game feel more difficult. We've certainly debated its usefulness. It gets even more complicated when you consider mixing it with other modifiers (minus Wildcard lol). We hope you continue to discover what our game has to offer!
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Y’know what, I didn’t realize the flexible worked both while playing it and while playing onto it. I think because the wildcards resolve into the card that they are after you play them, I thought the flexible cards worked the same way, but looking at the screenshot with fresh eyes, the fact that the +-1 token is still on the card when it’s on the pile makes that fairly obvious, lol.
In general, I struggled a bit with the 10/J boundary, and the K/A/2 boundaries. To be clear, that is not a criticism, I think that’s part of what makes your game great, since it’s not just comparing numbers. But yeah, that issue coupled with my confusion on the +-1 and it literally never occurred to me that Q on a flexible 10 was an option.
On my next run, I only ever bought autoplay upgrades, and I went a lot further since I didn’t have to do harder “math”. I got a 35x combo at a couple points, which felt great!