While the gameplay isn't bad, there are a just a few too many one-way drops and misable collectables/currency for me to not leave every room feeling at least a little annoyed. A way to drop through platforms you can jump through, and either a boost to jump height or reduction in the one-way drops would make the game much less annoying in both regards.
Also losing shards on death (especially pit death) is supremely obnoxious, the loss in damage output is outright painful