ok so, I was quite confused on my first playthrough of the game. There was a station right by the clouds, and it was pointed in the direction where it connected to the blocked part of the cloud. And I was like: what? So I restarted. And yea, basically like many others mentioned, there were possibilities of illegal stations. And stuff like this happened too, which is avoidable through a slight detour, but it didn't feel that nice...
Next, route connections felt kinda weird too. Like in the scenario that I just showed, players would want to connect to the bottom one, but are forced to connect to the side. With how the routes are placed using only a click though, I do get that it is like impossible to guess the intentions of the player, so maybe the routes connection system should be reworked so that players get to specify it? Also on a side note, I somehow managed to destroy whatever was in the clouds in this specific scenario... didn't really happen again so idk what happened there lol.
Anyway, routes aside, I wanna talk about the upgrades, which again like some already mentioned, had duplicates... And most of the upgrades were pretty weak imo, which brings me to balance: The game's difficulty scaled far too quickly. Most upgrades just weren't enough to keep up, making the game length limited to around only 5 rides most of the time. I say most of the time because like others have mentioned (everything i wanna say is mentioned already loll) the overpowered hype train exists. Only with that power up does the game balance feel better... But well, this upgrade doesn't appear that often, at least from my experience.
Next, there's a few more minor nitpicks which I'll quickly go through: the passengers counter of the main station is kinda slow when lots of people are transferred. The camera is not able to move down further than the main station, which is fine, but felt weird. The build and demolish tools are buttons rather than LMB and RMB, which imo are more intuitive and less clunky to use.
Alright, the bads of the game aside, I do wanna give credits on the polish of the game. It actually felt really nicely polished, with the animations and whatnot. The sound design and music was also pretty nice, and the art too! And- this part tells me that this game actually has quite some potential: once i got the hype train upgrade (on my 4th play i think), the gameplay actually felt fun. I could actually focus on strategizing my tracks. The upgrades finally felt somewhat useful. Essentially it made the whole experience nice rather than frustrating. And welp I got 11 rides in the end with hype train:
Tldr: if you fix the game balance, some rng issues, polish up on some current features so that they feel nicer, this game could actually be really fun!