Thankyou! I went overboard a tiny bit with the depth of field post processing effect haha. The cancel button not working is my bad, I realised last minute that escape won't work in the browser because that clashes with Itch's fullscreen control, so I changed it to 'C' however for some reason it didn't work ... at all - it was strange and will definitely look into it.
In terms of difficulty you are totally right lol, I do plan to add more depth, such as collectables - so you have to collect them before completing the level.
The placing blocks over other blocks is actually a bug I never even considered for some reason, you are meant to find away to 'consume' the arrow and come back around as the path is clear after that, however it is currently a great speed running strat! xD