The Space Storm Galaxy rain object (WaterFortressRain) is known to crash the game if placed in any other galaxy.

This is because it relies on the slowmotion effect which is triggered by timer switches (HipDropTimerSwitch).

We place the rain object in Flipswap Galaxy, as well as a timer switch whose Obj_arg2 is set to 2 (this is the setting that makes it trigger the slowmotion effect).

When these two objects coexist in a galaxy, the rain object works without crashing the game, as demonstrated in the video. (sorry for the bad quality-- if you can't see the rain, try viewing it in fullscreen)

Note: in the video, I use the switch only to demonstrate that the slowmotion rain effect works as well. You don't need to make the switch usable, it just has to be present in your galaxy. You can hide it inside a planet or somewhere else if you don't want its functionality.