Version 1.0.4 is a critical patch. The initial launch of Snow Bros. Special (1.0.0) was met with mixed reviews due to input lag and control sensitivity issues. Here is what the 1.0.4 update specifically addresses (based on patch notes and community testing):
If you are looking for information on the game's development, mechanics, or official updates, you can visit the Nintendo eShop official Daewon Media site of Snow Bros. Special or how to find official patch notes SNOW BROS SPECIAL -NSP--Update 1.0.4-.rar
Installing the SNOW BROS SPECIAL -NSP--Update 1.0.4-.rar file is a relatively straightforward process. Here's a step-by-step guide: Version 1