Hi there. Thanks for playing, I'm glad you like the concept and the art! And thanks so much for the feedback! I'm going to upload a new version of the game in a couple of days, which includes replayable levels, as well as a home screen. It's almost ready but there are some tiny details that I need to adjust before releasing it. ^^
Though I'd like to let the levels unfold in a linear way instead of making them selectable, I did add a new retry feature. Hopefully that makes it less frustrating, so do let me know if you play it! :D