Awesome game, except the menus are hard to navigate because the cursor doesn't match where the cursor actually is. Try to click Continue, and the actual cursor will show up for a second so you can trial and error to get in the right spot.
Bug: Play four levels of Sky. Get sick of the retarded circle shooters and quit to menu. Pick last level of Sky from main menu. Realize this level sucks too. Beat it. Sky levels will no longer show up on main menu.
Second mission is about 10 waves too long. And all the waves with the baddies that hover around the top feel the same. Player ship is too big. Should get healed between missions. Basic bullets are too slow, so missile is used for everything. Can't have commands bound to mouse wheel in an embedded window game. No feedback on which slot has weapon.
Deck editing bug: Make a new deck, add cards, name it, save it. Don't edit deck editing screen. Make more changes, save it, get error "Deck with that name exists". First save should save and then enter edit mode on that deck.
The innate ability of adding 10 to the cost of all enemy powers might be a little overpowered. If I had the card I'd use it every single game, which is a bad sign.
Figured out the bug. If the hint gives you a difference that hasn't appeared yet, the level can't be finished. Like giving you the outside house color change before sunrise.
Re: Store stuff disappearing. The three on the healing potion doesn't mean you get to buy 3, it means he has 3 for sale. But if you buy the third one, everything in the store disappears. I had bought and sold several things before it happened this time.