Really nice puzzle game (that turned into a rage game when i accidentally fell down a hole back to the very start!)
I really liked the graphics of this game and I cant exactly put my finger on it. They are clean and don't detract from understanding the puzzle, but the layout, textures and world decoration really gave it this sort of atmosphere that took me a little by surprise for a game blocks from the periodic table.
everything worked well gameplay wise and i enjoyed figuring things out. there was enough variation to build on things the player had already figured out and then change it or push it in a slightly new direction. The controls were tight enough the platforming never felt unfair. unfortunately i couldn't finish it and gave up when i fell back to the beginning (maybe I should be less _salty_ about it).
Overall i feel like you had an interesting idea and executed on it really well with a tight time frame. great job, thanks for sharing!