I love this one. If you click in the red box after you've clicked any card without an enemy target, you can play that card repeatedly... regardless of whether or not you have one in your hand. Tested with Shields Up!, Repair Drone, Prime Defense.
The equipment menu is a hot mess. If you click on a card once you can add it to all three slots. Once I added the drone dispenser card to the third slot I could put another card over it but it would not save the changes when I left the menu, it always went back to drone dispenser.
It also seems like the effect of equipment optimization is persistent, whether or not it is equipped. I don't know if that's because the card has actually switched places with drone dispenser and only the image did not change or what.
If you set the game to windowed mode and return to the main menu it makes the game full screen again.
If you have full energy and Matter Converter and Auxiliary Reactor are equipped and you use Last Resort, not only does it give you another energy, it also does not take away the energy for the cost of the card. So you start with 4 energy, play Last Resort and end up with 5 energy.