Hey Fen, it looks like the Christmas ones aren't tagged for Windows. I had to download from the website and couldn't install through the itch app. Super fun!
A downloadable lifestyle for Windows, macOS, and Linux
Slap: Left Mouse or E
Now with Christmas!
Click download now to get access to the following files:
SlapGame_win32.zip 17 MB
SlapGame_win64.zip 18 MB
SlapGame_Christmasver_win64.zip 14 MB
SlapGame_Christmasver_win32.zip 12 MB
SlapGame_Christmasver_lin32.zip 15 MB
SlapGame_Christmasver_mac32.app.zip 15 MB