Thank you for playing! How small is the window? It is specified with 600x400 and should work even without resizing (in fact maximizing caused one of the other reviewer to completely miss out on the item transfer because they never had the chance to accidentally trigger it)
If I ever continue this I'd probably do away the whole window gimmick lol.
The game freezing part is unfortunate 😞. It happened occasionally for me like once in every 3 full playthroughs, couldn't replicate enough to identify the issue.