If not right now, do you have any plans to someday make the Unity compatible with pixel FX designers?

I think this is going to be very helpful for so many other developers.

Compatible in what way? The tool has been designed as a standalone able to export the animations in various formats.

Integratios with other softwares like unity i'm afraid that nost possible sorry. The unique way is export the animation in .json format and build yourself by code some way to read all that values to be used in unity.

I wanted this program to transform work within the unity. Could you support the unit prefabs during the export later?

p.s : Could you create a pop-up that asks you to save when you exit the program