Hey there, Sokpop! I'd love to purchase several of your games, but I noticed there isn't a Linux version. I'm sure that there are other Linux users who would love to purchase your games, too!
While I could run the game under WINE, I think that adding an option for a native Linux game would be really nice. If you're worried about a testing environment, you could always run it under an Ubuntu 18 VM!
If in the future you DO offer a Linux build for your games, I'd be glad to share it with the few Linux Gaming communities I'm in.