The number of remaining stages is always displayed, and you pick up bullets to clear the stage and aim for the goal as quickly as possible.
There are five types of bullets, and you can use the characteristics of each to overcome the steep footholds and find the optimal route to reduce the consumption of bullets, or you can eliminate all enemies in a spectacular fashion and then take a safe route.
How you fight is up to you.
Enjoy simple battles with 2D action.
I made this work after a lot of trial and error and effort.
This is my first post, so please understand that there may be some problems.