Unknown game
Hello, Im looking for help figuring out a game I use to play back in the day. First, it wasnt in English, that's why I dont know a name, case was in Japanese and everything in game was. It was an auto side scroll bullet hell, not set in space or any realistic war scenario. You start off as like a little tank and pick up upgrades and parts to become a full mech. It had upper and lower levels that you could access by falling down holes or going up stairs. I remember it being super hard and think I made it to the second level like 3 times. It had basic city scapes, kind mute/tan colors mainly and the lower area was mainly reds and blues and kinda felt like going into a circut board. If anyone has ideas for what it could be, I would be appreciative.