Very nice. Didn't beat it; the final area just got too silly. (parts of the second-to-last area had a few too many lasers as well, I had no dang idea what was happening most of the time and just brute-forced it)
Movement feels very slippery for how precise you need to be (at least on keyboard), and the boss encounters are absolutely trivial compared to how ridiculous the platforming gets, but it's got solid mechanics and wonderful art. The addition of a map and fast travel points seems a bit superfluous in the game's current state, but I assume it's planned to be less linear eventually.