After 30 years of not-assembly-coding I wanted to start a small project for my beloved Amiga 500.
Because many games did not use the full PAL resolution (320x256), I wanted to try exactly this.

Visual Studio Code with Amiga Assembly plugin
FS-UAE (for running/debugging)
Tiled for Level-Editing
Eclipse for Tool Development
LibreOffice Calc for definition of object movements

The game is tested using FS-UAE (v3.1.66) and vAmiga (v2.5) on macOS.
Also tested on my Amiga 500 (rev. 6a) using Kickstart 1.3 and 2.0 with 1 MB Chip-RAM and 1.5 MB Slow-RAM.

Should run on any PAL-Amiga with at least 512kb Chip-RAM.
When using Kickstart v2.x or higher and/or external floppy drives or hard drives are connected, additional 512 kb RAM of any type may be necessary.
The game uses a DOS disk, so it should be no problem to install the game on a harddisk.
When running the game in an emulator there could be some slight stuttering. This is a problem because of most modern systems having a framerate higher than 50Hz. The game runs at 50 Hz and on my Amiga 500 and external monitor (that supports 50Hz) the scrolling and sprite movements are totally smooth.

Before program can be assembled and run you must run the Java Application found in "data/data_tool".
It produces necessary asm and binary files from the source files of the various formats.
An installed and ready-to-use JDK 21+ is required.

CD into the folder "data/data_tool" and issue the following command or use the VSCode-Tasks for building.

./mvnw spring-boot:run -Dspring-boot.run.arguments="./data_files_config.yml"

The ADF for download can be found here.

Since my composing skills are absolutely zero the game uses music created by Krzysztof Odachowski.
Find out more about him by visiting his Bandcamp page.
Learn more in the data folder.
What I like most about his music is the great qualitiy with minimal memory usage. Awesome tunes!

Since my drawing skills are close to zero the game uses the wonderful NeonWorld-Tileset created by Kevin Saunders.
You can find the graphics online here.
Learn more in the data folder.
I like this tileset because it has everything you need on only one screen and uses only 16 colors. Amazing!

ptplayer.asm (downloaded here on 2022-11-20)
The only change by me is that VBLANK_MUSIC is set to 1 and source is reformatted by Amiga Assembly (VSC plugin).

inflate.asm (downloaded here on 2022-11-23)
The only thing added by me is the "xdef inflate" directive and source is reformatted by Amiga Assembly (VSC plugin).

Playership can move and fire shots. Shots collide with background. There is now also collision detection between shots and enemies. Player dies on collision with background or enemies.
The video linked below runs at 50fps. If your monitor runs at a different framerate (that is not a multiple of 50) the video will stutter.

Some kind people mentioned this little project on Amiga-News and Indie Retro News.
Thank you guys, this definitely boosts my motivation to continue working on the game.