I was able to get the game to start, but like others mentioned, I wasn’t able to see the coaster I needed to copy. It might be helpful to include a short YouTube playthrough video on your itch.io page (which is already coming along very nicely) so players can see how it’s intended to work - just a quick visual reference could go a long way! That said, even though I was unable to really play it, I still tried to dig in for some feedback for you.
I really appreciated some of the thoughtful touches, like the fade-in/fade-out animation on the GMTK logo and your name, and the smooth transitions on the main menu buttons flying in. Small details like that really help give it a polished feel. The soundtrack was also very lovely and really leaned into that cozy game atmosphere - I love some good lofi beats.
Even though the gameplay is short and the final build is incomplete, it already shows a solid level of polish and care through its design, and the vision is there.
I could absolutely see this evolving into a fun mobile game if you decided to keep developing it. With a bit more work on the art style, a cleaner player HUD, and maybe a short tutorial level (perhaps introduced by a cute roller coaster mascot!) you’d have something really charming and accessible that could easily scale. Would love to also see you expand on the narrative here and find a way to bring it to life through the gameplay, from beginning to the end.
Making this whole game in a single day is no small feat, and I think you did a great job overall - despite the faults, the vision still comes through clearly. Let me know if you are able to get it fixed, or upload a video! Would love to see it how it's intended to look.