Congratulations on your first game jam!
A lot of odd design choices but everything seems to work correctly, which is the most important part.
The mouse aiming is really weak. A way to increase the sensitivity in the menu would be nice, or otherwise try to use a higher sensitivity as a default.
I never figured out how the scoring system works with the dropped clocks.
Also you might want to look into using something called “Nearest Neighbor filtering”, which is a setting you can use on your textures/materials to get nice crisp edges for pixels. It might currently say something like “Linear” or “Mipmap” but I’m not very familiar with Game Maker.
Hope to see you again in another jam! Keep learning and pushing yourself and you’ll do great \o/