Felix, you are too kind!
It did, at the time, go beyond what a normal bitsy could do. But I think the updates to Bitsy lately have pretty much changed that, as things like "Exit from Dialogue" which I used before was a hack, but now is part of Bitsy with its updates. I think you might be noticing Transparent Sprites, which I used in the game with the help of Borksy, the hack gathering tool for Bitsy. There are all kinds of hacks available, such as including music, etc. But I think the only ones I really used were Exit from Dialogue and Transparent Sprites.
Anything in particular in the game that caught your eye as being beyond Bitsy's abilities? I could have done a great deal more-- such as coloring sprites differently, without even using hacks. Because you have access to your game's source code you can make all kinds of changes if you just know where to look. A great resource is the Bitsy Discord! They are all kind and helpful. Go to the bitsy page and click the link that goes to the discord-- and there, ask for some specific help in the Tips and Help channel.
Otherwise I'm happy to help you figure out the things I did in this game! Just let me know! I'm on the discord as Seven.