Hello Geir. I'm a Commodore MAX owner and recently I asked C64lover.com to make a cartridge with Wave Hero, so I could play this lovely game on my real machine. He produced a cartridge with version 1.4 of the game, which suppose to be the working one. Unfortunatelly it turned out that the game still doesn't work on MAX. I recorded a video, so you can see how it looks like. The game launches, but it doesn't react to fire button. I even did a test in BASIC to proove that the port and the joystick itself work, then I plug the cartridge in. As you can see - no reaction to fire. What can be also observerd - after ca. one minute the game freezes and after another half minute - some artifacts are popping up on the screen. Sometimes it happens that the background becomes orange/red after another minute, but I couldn't reproduce it while recording.
The cartridge itself is fine, because I tested in on C64 and the game works great on it.
Here is the link to the video I made: