For some reason your phone denied the app permission to read the saves. I suggest you to backup your saves, delete the game, install again, and restore your saves. Read above to find where the saves are.
Vendena
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Sorry about the awful late reply. I didn't see the notification. Performance and stability vary a lot depending on your phone's hardware. A quick search says it has very little RAM compared to what's the standard these days. It should be enough to play the game, but again, it depends. Try to close as many apps as you can, to free up some resources.
Yes, you can copy your save to your computer. Read a little above to find where are locations of the saves. All you need to do is copy and paste.
The game is made in a way that you won't miss anything, so no worries of doing stuff in a specific order, or stuff like that. There are no timed events, time limits, or similar. That said, the game focuses on intertwined stories, so you can't just focus on a single heroine from start to finish. You'll have to branch to unlock requirements.
You can, though, skip some content. Stuff like Aurora, Platinum, and such are not enforced. The repeatable beach, pool, etc. Ignoring those won't penalty you in any way, other than you just out missing on game content.
Since you're dealing with a mod produced by someone else, I cannot help a lot since I don't know how it works. That said, a bit above the Development Log in this site, you can see where the game stores it's saves. You could try to find where this mod stores it's saves and copy it. This might work or not depending on what the mod does. Good luck.
Ah, the second building bug. You have two options to fix it. Edit your save and change these values:
Location_SB_Bath_Discovered
Location_SB_Door_Discovered
Location_SB_Kitchen_Discovered
Location_SB_Living_Discovered
To True.
Or, wait to July 17 for the game update and ask The Mysterious Heroine VI to fix it for you.

