The graphics and music are fantastic, and the core puzzle's neat: You automatically swap your current power-up when you move over a new one, so you need to find the right one for the right job, then figure out how to get back to where you need it without crossing paths with another power-up. Unfortunately, the power-up icons only show you one of the two abilities each power-up has, and there are several you only get a handful of times, making it hard to remember which does what. This might seem like a small issue, but it added way too much time to the last level for me.
My progress: finished on normal with ~20 collectables