I'm playing on A500 and Winuae Emulator, here's a little feedback:
On a real Amiga 500, it's frustrating to start the same level over and over again, I'll try to explain it to you.
You complete a level with the code, then you move on to the next level, but when you lose all your lives, you have to start the level you already completed, so most of the time you have to redo the previous level.
Otherwise, I found a bug, (see the image below), when you are on the ladder you go to the left and you press the shoot button the character dies for no reason.
I also found a place quite difficult because the crates were too far away (I often had to start again).
Thank you for the regular updates, they are very pleasant to test