Your art and theme look great. The city and the train gave me final fantasy 7 overworld vibes. It is a fun take on the theme but I maybe would have liked to have some more agency as a player.
Maybe let me control a bigger turret with my mouse or let me collect the xp with my mouse. It would perhaps also be fun to have some enemy variation. a big slow tanky falla or a smaller faster one.
But it's a jam game and of course and time is limited. Great job!