Well, I haven't practised pixel art for quite a time and lost way more time than I should variating the procedural elements. I could't spare time to polish and improve the aesthetic as a whole. Should have gone for simple and minimalistic art style. And yes there are some two major bug one of them triggers if you force your self into a stone's corner that makes you stuck in there and another one triggers when you release a key at the end of key's filling animation that ends the game instantly. But also you can use that final bug as a score saver so it might be a feature