Steam says:
"Dungeon Crawlers is a game designed to explore the fun and funny concept of what "Ghostbusters" might've looked like if it were set in a dungeon. It's a turn-based strategy game that is easily accessible."

The keys should work. However, if there is a problem just leave a comment and I'll try to replace the key. If that should not be possible, please agree to have this giveaway deleted. Thanks in advance for your understanding in that unlikely case.