Hi there!
Thanks so much for this massively encouraging comment - so great to hear you liked the game so much!
You will be happy to know that:
1) We're working on a ton of new cards! So far we have more than 80 new cards that we're testing out.
2) We're busy testing a bunch of new enemies too, and all the boss have been improved too!
Thanks so much for playing, and once again for the wonderful feedback. Hope you'll have a blast with all the new stuff we're cooking up!