The v1.1 Patch fixes some issues but introduces a game-breaking issue with the Aquatic Combat Stage 6 boss.
To run correctly in DOSBox, change cycles=auto to cycles=30000. Leave all other DOSBox settings at their defaults.
This is caused by choosing the joystick control option and then restarting the game without it. Either reattach a controller or delete STARGUN.CFG.
Ensure you are using cycles=30000 (see Run in DOSBox) and Refresh Rate is set to Fast in-game.
Ensure you are using cycles=30000 (see Run in DOSBox).