I have been playing and I found a bug that seems not to be reported yet. In level 2 when I collect the keys needed to open the three doors of the first screen they don't open. I played in a real breadbin C64 with Kung Fu Flash (tested with the crt and d64 versions).
To finish level 2 I had to use the first key I found with the first door of this screen. When I came back with the two keys left the rest of the doors can be opened without problem.
I have used the C64 sprite collision hardware. So, the collision detection is perfect. The problem is not the collision detection but the relative few time to bypass some enemies or the exact timing required to avoid them. In fact, this version is much easier than the original ZX Spectrum version.
