Nicely done for your first delve into building a coaster! I think the bottom half especially is pretty spot on shaping wise.

I think the top half could have benefited from having the hills be a little more pronounced. They look a bit flat compared to the real ride. Maybe if the top horizontal supports were one blue rod lower it could have made it possible for the hills to be less flat and a bit more exciting.

Zacspins like this are definitely a great place to start with micro knex track. Keen to see what you come up with next!