An interesting and dynamic game! =)
What did not like:
- the music is monotonous, gets bored quickly;
- run the game in full screen mode or somehow block the mouse cursor, otherwise it is easy to click outside the window with such dynamics (it can pause at least if the player is outside the window). I accidentally opened the game like that. =)
The source code can be laid out in an archive, which is made by GMS 2 itself, for this you need to select the File - Export Project menu item. As a result, there will be an archive with the * .yyz extension