One thing I'd adjust is the line under the battlements on the backside, and maybe making the lines smoother/follow the curve better.

the point snap option works just like grid works. with grid, your cursor will automatically move to the nearest point on the grid. with point snap, your cursor will automatically move to the nearest endpoint on a line in your track. it does not draw a line, it just moves your cursor. maybe a better name for it would be cursor snap, as that describes it well

the line snap draws a line. the line starts from the nearest endpoint on a line in your track and ends at your cursor. clicking with your mouse will place that line

can someone explain what the 3 types of snaps do

so when you press the snap hotkey (alt key is the default) or press the magnet icon:

• line snap will draw a line from the nearest line endpoint to your cursor
• point snap will snap your cursor to the nearest line endpoint (similar to how grid snaps your cursor)
• click snap will draw a line from the last spot you clicked on the canvas to your cursor

and when you draw a line, you are also able to snap the second point on the line to the nearest line endpoint or powerup. the number on the left is how close you need to be to another line endpoint to snap to it