Sadly Gacha nebula is not for weak phones, It crashes in less than a minute after opening it
at first I thought it was because my phone is weak, but It seems like Gacha Nebula doesn't work on 32 bit phones at all, many people that use 32 bit phones have the same issue of the app closing itself shortly after opening it, I will patiently wait for the update since it's the only option I have, for now, Gacha Nebula is out of reach for me and for other 32 bit users.
same for me, I can open the game but it lags a lot and then closes itself in less than a minute after opening it, I looked at the support channels and the nebula bug reports in the Gacha nebula discord server, it seems like every 32 bit user is having issues with Gacha nebula, all that we can do is wait for the update. (You can check if gacha nebula has been updated here or here)