Thanks for letting us know. On your first run did you get stuck on the postcard menu? That's the bug we're aware of there and haven't found a solution.
Also, was the game stuttering for you (like voice lines getting stuck a bit, Lumen being a little difficult to control)? The game is not optimized right now so it requires really powerful computers to run well. This will not be the case on the final version.
Glad you enjoyed it :)