The settings definitely make me think of summer, but without knowing much about doki lore, i can't really place any of the actual levels to their references (if there were any). Overall a simple game with intuitive controls and mechanics. However, I'll argue that the "chain reaction" aspect was a little lacking. Was expecting some big balloon pop chain somewhere, or perhaps even going from the beach to some alien planet or something wild. Midway through, the level progression went from a purple portal to a bright white opening, which was a little confusing, but not a big deal. All the models were really cute and the music was great.