Dig the aesthetics and navigating the UI / tutorial was fairly easy - I didn't get lost.
For now I've only played a few levels but I can see a lot of potential for mechanics.
I'd recommend adding some stronger highlights or outlines to clickable objects. I was a little confused at the level select screen. Having the buttons "indent" is great visually but hovering over levels and some buttons could use extra oomph - Especially since your keeping the UI sort of flat (which is good aesthetically so keep at it!)