The game concept is great and as it is still beeing developed, I hope there might be more features coming. Gameplay, Idea, Graphics and Music are all fine.
As has been said before, controlling where an element will spawn is hard. Its always spawning in the lowest place and if theres multiple, it will choose leftmost place on the lowest level.
Thus requires thorough planning and a bit of luck to unlock the high ranking elements. I finally managed to unlock the violett skull, but it took me a while. It wasnt easy, but the challenge added a good bunch to the games addictivness.
What this game could use is more play modes and maybe some specials.
I could imagine, for example, that for each unlocked element in a single play, you are granted single removal action for previously misplaced blocks.
Also, the ability to discard your next pair of blocks might be interesting.
Anyhow, it shouldnt make the game too easy, rather add some strategic options that one can save up till the air is getting really thin.
Also, the title suggest that there might be a bit of a story behind the game - at least the game title has some potential - and a cool background story would definatyl take this game to a whole new level.
I could picture a sereies of tasks where you have to create a certain composition of elements instead of just merging elements for the pure sake of it.
Good (draft of a) game after all, I'd like to see more coming.