I tried coding a game and tested writing 2 shinies. There were no errors in that part. The link to the source code of this game is below.https://github.com/DtjiPsimfans/Atom-Accelerator/blob/master/Atom-Accelerator.txt
However, the other game gives a weird error (as in screenshot) when writing multiple shinies (link as below).https://github.com/DtjiPsimfans/Book-Shop-Manager/blob/master/Book-Shop-Manager.txt
I hope Idle Game Maker can be fixed since I think there should be a bug.