it's really very promising, the game has huge potential. However, the demo is really hard, but I imagine that the final game will have more simple levels. The side blocks are particularly complicated I think. I'm having a bit of trouble with the pixel art font used, it's sometimes a bit hard to read, especially in the tutorial, which goes pretty fast. Otherwise, I'm quite impressed that there's already a level editor that seems to be quite powerful! Can't wait to see the full game!
Accessibility options are always a plus in my book!
In regards to this I would also reccomend adding colorblind options, a font choice that works well with people that have dyslexia as well as options to turn down some of the more extreme visual effects, so that everyone can have a similar experience. There might be something I have forgot to mention but I think that's all of them.