Thanks for giving it a play and the kind words. Sorry to hear about the controller. I'm using a Xbox 360 USB and that works in the browser version. Let me know what controller and OS and I'll see if there is any change I can make on my end. One of the things I tried to do this time was play test more with keyboard (or at lease equally). In the past I would always do my play testing on the controller and then come to find out the feel was terrible with keyboard controls. Sadly, the controller still handles better.
Getting the balance on the boss battles is tricky. I sometimes think the mechanic might be too easy and one little tweak suddenly makes it a whole lot more difficult. It's also been hard to test on my own since I know the timings and what he's going to do. Though I still die despite that. I'm also trying to figure out the right balance for the drop rate on hearts. In earlier builds you'd almost always have 4 hearts, but I've gone 8 stages and not picked up a single one (though not always because of drop rate, sometimes the bounce doesn't go my way). Thanks again!