I was also interested to know which version of gb studio you used
I had started it in 3.0 as that was out when we started the project. We migrated it to 3.2 to get some more features (like simultaneous timer scripts for example.)
I would have been keen to migrate to GBS 4 when that came out but we were so far into the project that the amount of work to successfully migrate it and complete the game before deadline was just too risky.