This game is a hidden gem, it is really quite fun due to the variety of enemies and weapons you get. It is still a bit rough around the edges mainly with the art and sound design, some music would have really added to the action and helped with engagement. However, the core mechanics are fairly well done and it is nice to see a train game (as we were initially planning to do one ourselves). This is very impressive for a solo dev in only 4 days and you should be really proud!