Thank you for your return ! It is very welcomed indeed !
For the quit button yes, there were plan for UI to be callable mid-game, but it kinda got sidetracked and in the end I didn't have time to implement it.
For the fact that the turn ends with you playing all your cards, it was by design (the point being that your hand must be emptied out BUT you can avoid it with Wild cards that end your play prematurely (allowing you to conserve some cards). The idea being that you must strategize your buff and attack cards to maximise the damage output. Needless to say, it remains a concept mostly xD)
But thank you for your return, I greatly appreciate it and will look into it (especially that nasty bug).