Thank you ! Yes the rotating isn't really smooth it's something that I will try to improve, same for the mouse wheel I will look for other ways that could more fun !
Could you tell me a bit more about the letter issue ? Is it that when you tape 2 pieces together they aren't moving together or do you feel like you have completed the letter but it doesn't end the level ?
No, all the SFX and music are from free assets that I found online, you can find the links for the musics in the description.
