Thanks for playing!
This game was one of the only games I have ever made for a 24 hour game jam while seriously trying to make something decent, and I am quite happy with it with respect to that. I also haven't really considered coming back to it and changing it much for the same reason--although I wouldn't say I will definitely never come back to it, it's pretty low on my list of priorities.
I do appreciate the suggestions, though! I think they all are pretty sensible.
To be honest, I don't remember what the intention was with respect to white blocks. When I've revisited this game I definitely feel like the ability to overflow them makes it a little too easy, perhaps, but I am pretty sure it was on purpose.
But, I'm very glad to hear positive feedback on this project! Thank you for the comment!