Hello,
I tried your game! I enjoyed it, I spent some good time and I see that you have clear ideas behind this work. I don't see any major issues, just polishing everything a bit more would make a really nice experience of it. For instance, give clearer visibility to foreground platforms in the section right after the train, to avoid confusion and to clarify where the player can land. Other than that, I think it is solid!
Cheers.
PS: don't hesitate to try our game