The game manual mistakenly infers that this is an AGA game, but in fact it is not.
However, for playing this game on an A500, you must have at least 1.5 MB of total RAM in your machine. Works fine with 1 MB of chip RAM and 0.5 MB RAM expansion, for instance.
Additional note for playing: use the cursor keys right/left to select the item currently in use (gun, bomb, etc.)