Wow, very good conversion, although:
1. I pressed the esc key after reaching world 2 level 4 with so much pain (it's something I managed to do with a single coin on the original arcade), and lost my progress (I was actually trying to ungrab the mouse from UAE on Amiga Forever to save a snapshot), I could not continue afterwards. This made me cry.
2. Please add a "level selection for the next run" into options, to let people exit the game, go out to take a beer with friends and then restart from the point they reached in the next session (at least from the beginning of the same level, I'd not pretende the exact checkpoint ;-)). The option should act just on the first run after being set, if player does not continue afterwards, he/she should start from level 1 unless he/she uses the same option again.
3. Please check the trampolines' behaviour in the arcade, because I feel it's somehow broken. Shouldn't they make you jump also without pressing the jump button when you use them?
4. Can't you cache anything in memory? Loading everything everytime breaks the action. Amiga is a multitasking computer after all, so disk may be accessed also while playing (I'd expect this to be fixed when a WHD image is provided, though)
5. The main difference I found with the arcade is how collision with enemies is managed. Your version is a little more punishing, although more precise (and requires quite more attention to perform the right sequence of moves to avoid/defeat enemies). Rolling stones and jumping frogs are quite more difficult to manage than on the arcade.
For the rest, I can only congratulate with you.