Mind control freezes the game when played on any enemy unless it is frozen, you are ensnared, or it otherwise doesn't try to act. Pipette freezes the game instead of increasing max hp. I will post replays in the future; didn't know you can do that. Also, the stash and being able to pay to remove cards/sell precious cards seem from card text like they should exist as menus but I haven't figured out where they are yet (I've only unlocked 9/13 classes I believe).
Thanks for your report.
>Mind control freezes the game
Fixed, will be published in next update.
>Pipette freezes the game
Fixed, will be published in next update.
>Also, the stash and being able to pay to remove cards/sell precious cards
You can access deck manipulation by pressing 'Deck' button in rewards window. (See screenshot below).
Upon first opening of this window, the game should have displayed the tutorial, which you can re-visit by clicking question mark in top-right corner. I understand it is hard to remember now, but can you please tell, perhaps the tutorial did not show or was unclear?
As for stash and card upgrades, these two features are locked behind achievements. You can see all achievements by pressing 'lock' button in the global menu. Search for 'stash' and 'upgrade' to see exact requirements (those requirements should be relatively easy, you have probably unlocked one or both already). After unlocking, corresponding buttons will appear in deck manipulation window.
I plan to publish next update in a few days.