Hi,
Sorry to hear about your problems, it seems that the only option left is to clear the cache and storage (just in case) and then to uninstall the game completely just to install a fresh build.
As you've pointed out, there are no endings yet, as the development is in an early stage and dev currently focuses on adding new content to the story and night time.
I personally have 3 saves (and 1 auto) and the game weights 335MB as well, so that's probably the expected size.
If you happen to uninstall the previous build, be sure to check here later, as the dev announced dropping a public build 0.2.2.8 with some bug fixes, QoL changes and some new events and interactions today.
Hope this solves your problem, if you happen to encounter any more bugs, please report them here or you could join our Discord server to use the form option for easier bug tracking purposes.
Cheers