The music was great, and the moment when the elevator opened with the music was satisfying. I enjoyed the boss blob guy as well.
Unfortunately I can't say much about the gameplay. Not a lot was communicated well. I saw that there were cards and there was a real-time system, but wasn't sure how to play my cards, what the restrictions were. Sometimes pressing space played a card, sometimes it didn't. The feedback and strategy just wasn't there and I ended up just mashing space over and over again to play whatever card was available until I got bored.
Kudos for attempting a multiplayer game, I assume the theme of exchange was somewhere in the co-op gameplay.