Thank you for playing and providing your feedback! I'm glad to hear that the visuals and audio are setting the tone well for the game, and that you found it more enjoyable once you snowballed the upgrades. I'll definitely take your suggestion for more variety into account, and try to incorporate more treasure, minibosses, and gimmick rooms to keep things interesting.
I'm sorry to hear that you experienced a crash after upgrading your HP, and I'll look into fixing that issue as soon as possible. Thank you again for taking the time to play my game, and I appreciate your support as I continue to develop it.