Thank you so much for all the feedback. I appreciate it. I'll address your last point first.
It was similar to Shrine-Warden because it inspired this game! I'm always looking for opportunities to try to implement a new genre each jam because I think its fun, and I usually end up learning new pieces of Godot. Different genres always have some new challenges. After playing Shrine-Warden I decided I'd like to take a jab at the rogue-like genre, and once I saw the theme of Train and thought of the moving rooms, I thought this was the perfect time to give it a try. I thought Shrine-Warden was beautifully executed, and incredibly fun. I think it surpasses my game in every category. :)
I would have loved to add more enemies, but I just ran out of time. Adding new enemy art, and AI behavior seemed like a lot of work, so I didn't prioritize it, but I think the game suffers the most from a lack of variety so perhaps it should have been a higher priority. I sunk too much time into the moving map.
A fast travel option crossed my mind too, but I wasn't sure what the best way to implement it would be. Perhaps that could have been a reward for completing a train, or it could have been a special train car that showed up on the map once visited. That would have been really cool.
I wasn't aware that being too close to the walls prevented shooting bullets. That should be addressed.
I'm not sure how much more train-like I could have made the game. The theme was really just used as the setting, and the inspiration for the twist on the traditional rogue-like grid room map.
Thanks again! I'm so glad you enjoyed it. :)